#964 Feat(application): pause, resume, resync and restart per environment (12/21)

Stack 12/21 · after #963 · next #965 · uses KubeVela kubevela/kubevela#7421 at runtime

Targets main but builds on #963, so the earlier stack commits show here too: review the last commit only. Merge after #963.

Description of your changes

Each environment can:

• pause and resume reconciliation;
• set how often it resyncs;
• schedule a workflow restart, or cancel one.

From the environment toolbar, and a reconciliation card on its overview.

Fixes #

I have:

• Read and followed KubeVela's contribution process.
• Related Docs updated properly. In a new feature or configuration option, an update to the documentation is necessary.
• Run yarn lint to ensure the frontend changes are ready for review.
• Run make reviewableto ensure the server changes are ready for review.
• Added backport release-x.y labels to auto-backport this PR if necessary.

Special notes for your reviewer

• These write the controller's own label and annotations (controller.core.oam.dev/pause, the resync and restart annotations), so the same Application behaves the same way outside VelaUX.