[#1711][FOLLOWUP] feat(coordinator): refactor the reconfigurable conf

[zuston]

What changes were proposed in this pull request?

Refactor the reconfigurable conf for coordinator side.

Why are the changes needed?

Follow up: #1711

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Unit tests

[github-actions[bot]]

Test Results

 2 433 files  +14   2 433 suites  +14   4h 59m 42s :stopwatch: + 1m 49s    933 tests ± 0     932 :white_check_mark: ± 0   1 :zzz: ±0  0 :x: ±0  10 819 runs  ± 0  10 805 :white_check_mark: ± 0  14 :zzz: ±0  0 :x: ±0 

Results for commit 59ef0f84. ± Comparison against base commit a0e88da5.

This pull request removes 1 and adds 1 tests. Note that renamed tests count towards both.

org.apache.uniffle.test.CoordinatorAssignmentTest ‑ testReconfigureNodeMax

org.apache.uniffle.test.CoordinatorReconfigureNodeMaxTest ‑ testReconfigureNodeMax

:recycle: This comment has been updated with latest results.

[zuston]

gentle ping @jerqi