HMS-5348: ensure order on module stream search

[jlsherrill]

Summary

we have to aggregate the the streams into modules, and are using a map. This doesn't preserve module ordering though, so this change ensures that the name order is consistent.

Testing steps

run the dao/TestSearchRepositoryModuleStreams test 10 times and see no failures

[jlsherrill]

https://issues.redhat.com/browse/HMS-5348

[xbhouse]

test passes consistently 👍 lgtm!

[mayurilahane]

testing it in stage

[jlsherrill]

snipped

[mayurilahane]

Verified on stage by repeatedly executing ascending and descending commands, yielding accurate results.

[mayurilahane]

cmd's used -

list modules in descending order:

curl --proxy http://squid.corp.redhat.com:3128/ https://console.stage.redhat.com/api/content-sources/v1.0/module_streams/search -u content7:changeme -d '{"urls":["https://cdn.redhat.com/content/dist/rhel8/8.5/x86_64/appstream/os"], "sort_by":"name:desc"}' -H "Content-Type: application/json" | jq '.[].module_name'

list in ascending:

curl --proxy http://squid.corp.redhat.com:3128/ https://console.stage.redhat.com/api/content-sources/v1.0/module_streams/search -u content7:changeme -d '{"urls":["https://cdn.redhat.com/content/dist/rhel8/8.5/x86_64/appstream/os"], "sort_by":"name:asc"}' -H "Content-Type: application/json" | jq '.[].module_name'