feat(stream): backfill resuming for sink

[kwannoel]

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What's changed and what's your intention?

Closes #12080.

• Recovery of the backfill progress (rw_ddl_progress) is unsupported currently. I will work on that separately.
• The backfill progress tracking is still visible if cluster did not restart.
• This PR makes sure that sink is recoverable even if backfill fails.
• This PR makes sure sink is immediately visible after first barrier, independent of whether backfill is complete.

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• I have added test labels as necessary. See details.
• I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
• My PR contains breaking changes. (If it deprecates some features, please create a tracking issue to remove them in the future).
• All checks passed in ./risedev check (or alias, ./risedev c)
• My PR changes performance-critical code. (Please run macro/micro-benchmarks and show the results.)

• My PR contains critical fixes that are necessary to be merged into the latest release. (Please check out the details)

Documentation

• My PR needs documentation updates. (Please use the Release note section below to summarize the impact on users)

Release note

SINK DDL statements no longer need to wait for backfill to complete.

[chenzl25]

LGTM! Maybe we should add a user-facing tag.

[codecov]

Codecov Report

Attention: 41 lines in your changes are missing coverage. Please review.

Comparison is base (b196953) 68.31% compared to head (c2e5099) 68.31%.
Report is 8 commits behind head on main.

Files	Patch %	Lines
src/meta/src/barrier/progress.rs	0.00%	28 Missing ⚠️
src/meta/src/manager/streaming_job.rs	35.71%	9 Missing ⚠️
src/meta/src/barrier/mod.rs	25.00%	3 Missing ⚠️
src/meta/src/rpc/ddl_controller.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13665      +/-   ##
==========================================
- Coverage   68.31%   68.31%   -0.01%     
==========================================
  Files        1523     1523              
  Lines      261833   261872      +39     
==========================================
+ Hits       178878   178885       +7     
- Misses      82955    82987      +32     

Flag	Coverage Δ
rust	68.31% <16.32%> (-0.01%)	⬇️

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[yezizp2012]

LGTM

[BugenZhao]

Didn't find this variant? 👀

[kwannoel]

Removed in https://github.com/risingwavelabs/risingwave/pull/13735/files, thanks!

It was used previously to indicate a new variant of stream job handling, but I realize I can just use a TrackingCommand without notifiers to accomplish the same thing, with less refactoring.