CAPI Operator: use 'run_if_changed' consistently in presubmit jobs

[furkatgofurov7]

Part of: kubernetes-sigs/cluster-api-operator#153

we use run_If_changed only in one presubmit job to ensure it is not run if only e.g. documentation is changed.
This PR makes sure that run_if_changed is used consistently in all presubmit jobs that should only be run if our code changes.

Changes ensure the following jobs also use run_if_changed:

• pull-cluster-api-operator-apidiff-main/pull-cluster-api-operator-apidiff-release-0-3
• pull-cluster-api-operator-test-main/pull-cluster-api-operator-test-release-0-3
• pull-cluster-api-operator-e2e-main/pull-cluster-api-operator-e2e-release-0-3 (run_if_changed was already in use, regexp was changed to more an explicit one)

Pros of using run_if_changed:

• less resource usage as we run a lot less jobs
• less waiting around and re-triggering for test jobs that are not relevant to doc PRs

[furkatgofurov7]

/cc @Fedosin @alexander-demicev @JoelSpeed

[Fedosin]

/lgtm

[furkatgofurov7]

/cc @dims

[alexander-demicev]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alexander-demicev, furkatgofurov7

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• config/jobs/kubernetes-sigs/cluster-api-operator/OWNERS [alexander-demicev]

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[k8s-ci-robot]

@furkatgofurov7: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

• key cluster-api-operator-presubmits-main.yaml using file config/jobs/kubernetes-sigs/cluster-api-operator/cluster-api-operator-presubmits-main.yaml
• key cluster-api-operator-presubmits-release-0-3.yaml using file config/jobs/kubernetes-sigs/cluster-api-operator/cluster-api-operator-presubmits-release-0-3.yaml

In response to this:

Part of: kubernetes-sigs/cluster-api-operator#153

we use run_If_changed only in one presubmit job to ensure it is not run if only e.g. documentation is changed.
This PR makes sure that run_if_changed is used consistently in all presubmit jobs that should only be run if our code changes.

Changes ensure the following jobs also use run_if_changed:

• pull-cluster-api-operator-apidiff-main/pull-cluster-api-operator-apidiff-release-0-3
• pull-cluster-api-operator-test-main/pull-cluster-api-operator-test-release-0-3
• pull-cluster-api-operator-e2e-main/pull-cluster-api-operator-e2e-release-0-3 (run_if_changed was already in use, regexp was changed to more an explicit one)

Pros of using run_if_changed:

• less resource usage as we run a lot less jobs
• less waiting around and re-triggering for test jobs that are not relevant to doc PRs

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