Shallow snapshot v2 - create snapshot validations in a cluster state update

[gbbafna]

Description

1. Adding IN_PROGRESS cluster state entry for shallow v2 snapshots. Associated clean up with this. This ensure whatever validations we are doing are atomic in nature.
2. Pinning timestamp before doing finalize snapshot .
3. Blocking concurrent v2 snapshots.

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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Codecov Report

Attention: Patch coverage is 34.70588% with 111 lines in your changes missing coverage. Please review.

Project coverage is 71.90%. Comparing base (7caca26) to head (5028938).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ava/org/opensearch/snapshots/SnapshotsService.java	31.54%	96 Missing and 6 partials ⚠️
...va/org/opensearch/cluster/SnapshotsInProgress.java	57.14%	5 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #15939      +/-   ##
============================================
- Coverage     72.04%   71.90%   -0.14%     
+ Complexity    64441    64390      -51     
============================================
  Files          5281     5281              
  Lines        301088   301191     +103     
  Branches      43500    43518      +18     
============================================
- Hits         216918   216575     -343     
- Misses        66438    66831     +393     
- Partials      17732    17785      +53     

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