Srep 3019 add more e2e tests

[tkong-redhat]

Adding more e2e tests for the following scenarios

• Add tests for SplunkForwarder CR creation and reconciliation
• Add tests for Splunk HEC endpoint connectivity (using mock endpoint)
• Add tests for failure check and retry
• Add tests for index configuration
• Add tests log collection and forwarding workflow configuration

Tests have been tested locally and in e2e image. Both passed without error.

SREP-3019

Assisted by Claude code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.44%. Comparing base (a141ee9) to head (ab6624a).
⚠️ Report is 11 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #395   +/-   ##
=======================================
  Coverage   72.44%   72.44%           
=======================================
  Files          11       11           
  Lines         704      704           
=======================================
  Hits          510      510           
  Misses        173      173           
  Partials       21       21           

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[dem4gus]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dem4gus, tkong-redhat

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[openshift-ci]

@tkong-redhat: all tests passed!

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