Fix Serverless registry-gc race condition

[moelsayed]

Description

Changes proposed in this pull request:

• Refactor the tag delete logic to check the function status right before deleting the tag from the registry, to ensure it's not being updated.
• ...
• ...

Related issue(s)

#16208

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[kyma-bot]

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

Test name	Commit	Details	Required	Rerun command
pre-main-kyma-validate-image-existence	9732935	link	false	/test pre-main-kyma-validate-image-existence
pull-function-controller-lint	9732935	link	false	/test pull-function-controller-lint

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