Added CA certs to web clients

[Cali0707]

Fixes #3129

Proposed Changes

To send an http request with TLS in vert.x, you need to call postAbs() (which we already do), and have the WebClient configured to trust the CA certificate for the destination. So, the only necessary change is:

• When creating an instance of WebClient, pass in the appropriate CA certificate if it is not null/empty

[codecov]

Codecov Report

Merging #3193 (af947d9) into main (4dd4f24) will decrease coverage by 0.09%.
The diff coverage is 25.00%.

❗ Current head af947d9 differs from pull request most recent head 6890ee1. Consider uploading reports for the commit 6890ee1 to get more accurate results

@@             Coverage Diff              @@
##               main    #3193      +/-   ##
============================================
- Coverage     63.45%   63.37%   -0.09%     
+ Complexity      754      753       -1     
============================================
  Files           167      167              
  Lines         11791    11803      +12     
  Branches        238      238              
============================================
- Hits           7482     7480       -2     
- Misses         3749     3760      +11     
- Partials        560      563       +3     

Flag	Coverage Δ
java-unittests	79.57% <25.00%> (-0.44%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...roker/dispatcher/main/ConsumerVerticleBuilder.java	61.94% <25.00%> (-4.39%)	⬇️

... and 2 files with indirect coverage changes

[pierDipi]

To support CA certs rotation and changes, we need to add them to the comparison here: https://github.com/knative-sandbox/eventing-kafka-broker/blob/4dd4f24c4f4f653d8d364d5ff4516195bdb330e5/data-plane/core/src/main/java/dev/knative/eventing/kafka/broker/core/reconciler/impl/ResourcesReconcilerImpl.java#L234-L254

[Cali0707]

/cc @pierDipi

[Cali0707]

/test unit-tests

[Cali0707]

/test unit-tests

[Cali0707]

/retest-required

[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707, pierDipi

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[Cali0707]

/retest-required