add PopulateControllerConfig in runner.go

[kaushikmitr]

This pull request introduces an important update to the Runner's startup process in runner.go. The main change ensures that the controller configuration is properly populated and validated before proceeding, improving error handling and startup reliability. Currently CRDs like inferenceobjective and inferenceModelRewrite is not being read by EPP during startup.

Key improvement to controller configuration:

• Added a call to PopulateControllerConfig on controllerCfg, which now validates and populates the controller configuration using the provided cfg. If this step fails, an error is logged and the startup process is halted to prevent misconfiguration.

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[ahg-g]

The PR that introduced this bug is #1967; and so it is impacting the last release @kfswain ; basically the last release infObj and modelNameRewrite are not working. @zetxqx this mean we don't have proper test coverage, an integration test should catch this.

[ahg-g]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahg-g, kaushikmitr

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[ahg-g]

/retest

[elevran]

is a patch release planned?

[kfswain]

/cherrypick release-1.3

[k8s-infra-cherrypick-robot]

@kfswain: #2300 failed to apply on top of branch "release-1.3":

Applying: add priority to admit request
Using index info to reconstruct a base tree...
A	pkg/epp/framework/interface/requestcontrol/plugins.go
M	pkg/epp/requestcontrol/director.go
M	pkg/epp/requestcontrol/director_test.go
M	pkg/epp/requestcontrol/request_control_config.go
Falling back to patching base and 3-way merge...
Auto-merging pkg/epp/requestcontrol/request_control_config.go
Auto-merging pkg/epp/requestcontrol/plugins.go
CONFLICT (content): Merge conflict in pkg/epp/requestcontrol/plugins.go
Auto-merging pkg/epp/requestcontrol/director_test.go
CONFLICT (content): Merge conflict in pkg/epp/requestcontrol/director_test.go
Auto-merging pkg/epp/requestcontrol/director.go
CONFLICT (content): Merge conflict in pkg/epp/requestcontrol/director.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config set advice.mergeConflict false"
Patch failed at 0001 add priority to admit request

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In response to this:

/cherrypick release-1.3

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