[AMORO-2365] Fix get target snapshot NPE when commiting

[HuangFru]

Why are the changes needed?

Close #2365.

Brief change log

• Add 'PLANNING' status in `OptimizingProcess.Status' and set it as default.
• Generic the TableOptimizingProcess when the table is planning and update it after planned.
• Change judgment in 'SnapshotExpire' to not expire the snapshot that is used for planning.
• Change the init SQL to make 'optimizing_type' default null.

How was this patch tested?

• [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

• [ ] Add screenshots for manual tests if appropriate

• [ ] Run test locally before making a pull request

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable)

[codecov[bot]]

Codecov Report

Attention: 21 lines in your changes are missing coverage. Please review.

Comparison is base (24dbeed) 53.14% compared to head (11c3582) 52.77%.

Files	Patch %	Lines
...ease/arctic/server/optimizing/OptimizingQueue.java	76.00%	7 Missing and 5 partials :warning:
...er/table/executor/TableRuntimeRefreshExecutor.java	20.00%	3 Missing and 1 partial :warning:
.../arctic/server/dashboard/utils/OptimizingUtil.java	0.00%	2 Missing :warning:
.../com/netease/arctic/server/table/TableRuntime.java	80.00%	1 Missing and 1 partial :warning:
.../optimizing/maintainer/IcebergTableMaintainer.java	83.33%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2366      +/-   ##
============================================
- Coverage     53.14%   52.77%   -0.38%     
- Complexity     3785     4374     +589     
============================================
  Files           488      534      +46     
  Lines         25641    30384    +4743     
  Branches       2450     2967     +517     
============================================
+ Hits          13628    16035    +2407     
- Misses        10953    13059    +2106     
- Partials       1060     1290     +230     

Flag	Coverage Δ
core	53.11% <71.62%> (-0.04%)	:arrow_down:
trino	50.93% <ø> (?)

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[HuangFru]

When the table is planning:

After planning:

When the table is planning:

Restart the AMS:

When the table is planning I set self-optimizing.enabled to 'fasle':

[HuangFru]

I left some comments, please take a look @HuangFru

Fixed.

[github-actions[bot]]

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[github-actions[bot]]

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