fix: only set LabelWorkflowRunPRRef when needed and correct storageClass

[knight42]

What type of PR is this?

/area cicd /kind cleanup

What this PR does / why we need it:

• Only set LabelWorkflowRunPRRef when needed(e.g. we don't need to set this label if the workflorRun is trigger by tag release)
• Correct storageClass name

Which issue(s) this PR is related to (optional, link to 3rd issue(s)):

Fixes #

Reference to #

Special notes for your reviewer:

/cc @zhujian7

Does this PR introduce a user-facing change?:

* Only set LabelWorkflowRunPRRef if workflowRun is triggered by PR
* Change storageClass name to `platform-storageclass`

[zhujian7]

cc @hyy0322

[zhujian7]

/lgtm

[caicloud-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zhujian7

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