Trigger pipeline metadata controller reconsile when update pipeline cr spec

[chilianyi]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #836

Special notes for reviewers:

Please check the following list before waiting reviewers:

• Already committed the CRD files to the Helm Chart if you created some new CRDs
• Already added the permission for the new API
• Already added the RBAC markers for the new controllers

Does this PR introduce a user-facing change??

[chilianyi]

/cherrypick release-3.3

[ks-ci-bot]

@chilianyi: once the present PR merges, I will cherry-pick it on top of release-3.3 in a new PR and assign it to you.

In response to this:

/cherrypick release-3.3

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[zheng1]

/lgtm
/approve

[zheng1]

/approve

[ks-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zheng1

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Needs approval from an approver in each of these files:

• OWNERS [zheng1]

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[ks-ci-bot]

@chilianyi: new pull request created: #840

In response to this:

/cherrypick release-3.3

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.