NO-JIRA: Replace the Gemini PR review workflow with a streamlined Gemini Dispatch workflow

[jiridanek]

Description

• NO-JIRA: gha(workflows): add GitHub Actions workflow for Gemini Pull Request Reviews #1489
• NO-JIRA: ci(gha): fix gemini-pr-review.yml to handle pull_request_target trigger and add instructions for non-comment triggers #1492

How Has This Been Tested?

Self checklist (all need to be checked):

• Ensure that you have run make test (gmake on macOS) before asking for review
• Changes to everything except Dockerfile.konflux files should be done in odh/notebooks and automatically synced to rhds/notebooks. For Konflux-specific changes, modify Dockerfile.konflux files directly in rhds/notebooks as these require special attention in the downstream repository and flow to the upcoming RHOAI release.

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[github-actions]

There is a problem with the Gemini CLI PR review. Please check the action logs for details.

[openshift-ci]

@jiridanek: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/images	e0340a6	link	true	/test images

Full PR test history. Your PR dashboard.

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