BE: SR: Fix verifySsl for SR serde

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Issue submitter TODO list

• I've looked up my issue in FAQ
• I've searched for an already existing issues here
• I've tried running main-labeled docker image and the issue still persists there
• I'm running a supported version of the application which is listed here

Describe the bug (actual behavior)

setting kind
KAFKA_CLUSTERS_0_SSL_VERIFYSSL: "false" from #422
perfectly turns off checking for kafka-connect, scheme-registry, but when trying to read message values via Serde SchemaRegistry, an ssl error occurs

Error getting schema for 'develop.updated.v1.dev'(VALUE) with serde 'SchemaRegistry'
javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

Expected behavior

No response

Your installation details

1.1.0

Steps to reproduce

use
KAFKA_CLUSTERS_0_SSL_VERIFYSSL: "false"

Screenshots

No response

Logs

trace-kafka-ui.log

Additional context

No response

[fallen-up]

#853