Update: allow jsonl files support automatically in file upload section

[Saumya40-codes]

Which problem is this PR solving?

Fixes #2458

Description of the changes

• Currently we werent able accept the jsonl files automatically in our upload files section. (only json was allowed)
• Now, jsonl is getting supported to upload automatically

How was this change tested?

• Uploading jsonl files through drag and drop

• Clicking upload button which was able to detect support for jsonl files

• I'd tested against this input

  {"resourceSpans":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeSpans":[{"scope":{},"spans":[{"traceId":"","spanId":"","parentSpanId":"","name":"operationA","startTimeUnixNano":"1581452772000000321","endTimeUnixNano":"1581452773000000789","droppedAttributesCount":1,"events":[{"timeUnixNano":"1581452773000000123","name":"event-with-attr","attributes":[{"key":"span-event-attr","value":{"stringValue":"span-event-attr-val"}}],"droppedAttributesCount":2},{"timeUnixNano":"1581452773000000123","name":"event","droppedAttributesCount":2}],"droppedEventsCount":1,"status":{"message":"status-cancelled","code":2}},{"traceId":"","spanId":"","parentSpanId":"","name":"operationB","startTimeUnixNano":"1581452772000000321","endTimeUnixNano":"1581452773000000789","links":[{"traceId":"","spanId":"","attributes":[{"key":"span-link-attr","value":{"stringValue":"span-link-attr-val"}}],"droppedAttributesCount":4},{"traceId":"","spanId":"","droppedAttributesCount":1}],"droppedLinksCount":3,"status":{}}]}]}]}
  {"resourceSpans":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeSpans":[{"scope":{},"spans":[{"traceId":"","spanId":"","parentSpanId":"","name":"operationA","startTimeUnixNano":"1581452772000000321","endTimeUnixNano":"1581452773000000789","droppedAttributesCount":1,"events":[{"timeUnixNano":"1581452773000000424","name":"event-with-attr","attributes":[{"key":"span-event-attr","value":{"stringValue":"span-event-attr-val"}}],"droppedAttributesCount":2},{"timeUnixNano":"1581452773000000424","name":"event","droppedAttributesCount":2}],"droppedEventsCount":1,"status":{"message":"status-cancelled","code":2}},{"traceId":"","spanId":"","parentSpanId":"","name":"operationB","startTimeUnixNano":"1581452772000000343","endTimeUnixNano":"1581452773000001089","links":[{"traceId":"","spanId":"","attributes":[{"key":"span-link-attr","value":{"stringValue":"span-link-attr-val"}}],"droppedAttributesCount":3},{"traceId":"","spanId":"","droppedAttributesCount":4}],"droppedLinksCount":2,"status":{}}]}]}]}
  {"resourceSpans":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeSpans":[{"scope":{},"spans":[{"traceId":"","spanId":"","parentSpanId":"","name":"operationA","startTimeUnixNano":"1581452772000000321","endTimeUnixNano":"1581452773000000789","droppedAttributesCount":1,"events":[{"timeUnixNano":"1581452773000000826","name":"event-with-attr","attributes":[{"key":"span-event-attr","value":{"stringValue":"span-event-attr-val"}}],"droppedAttributesCount":2},{"timeUnixNano":"1581452773000000826","name":"event","droppedAttributesCount":2}],"droppedEventsCount":1,"status":{"message":"status-cancelled","code":2}},{"traceId":"","spanId":"","parentSpanId":"","name":"operationB","startTimeUnixNano":"1581452772000200521","endTimeUnixNano":"1581452773000004789","links":[{"traceId":"","spanId":"","attributes":[{"key":"span-link-attr","value":{"stringValue":"span-link-attr-val"}}],"droppedAttributesCount":5},{"traceId":"","spanId":"","droppedAttributesCount":2}],"droppedLinksCount":3,"status":{}}]}]}]}
  {"resourceSpans":[{"resource":{"attributes":[{"key":"resource-attr","value":{"stringValue":"resource-attr-val-1"}}]},"scopeSpans":[{"scope":{},"spans":[{"traceId":"","spanId":"","parentSpanId":"","name":"operationA","startTimeUnixNano":"1581452772000000321","endTimeUnixNano":"1581452773000000789","droppedAttributesCount":1,"events":[{"timeUnixNano":"1581452773000010925","name":"event-with-attr","attributes":[{"key":"span-event-attr","value":{"stringValue":"span-event-attr-val"}}],"droppedAttributesCount":2},{"timeUnixNano":"1581452773000010925","name":"event","droppedAttributesCount":2}],"droppedEventsCount":1,"status":{"message":"status-cancelled","code":2}},{"traceId":"","spanId":"","parentSpanId":"","name":"operationB","startTimeUnixNano":"1581452772000011821","endTimeUnixNano":"1581452772000012924","links":[{"traceId":"","spanId":"","attributes":[{"key":"span-link-attr","value":{"stringValue":"span-link-attr-val"}}],"droppedAttributesCount":2},{"traceId":"","spanId":"","droppedAttributesCount":2}],"droppedLinksCount":5,"status":{}}]}]}]}
  

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• I have added unit tests for the new functionality
• I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

[Saumya40-codes]

@yurishkuro do we need to consider any other scenario while accepting jsonl files by default?