Adding UTs for snapshot module

[trisha-dell]

Description

Adding UTs for snapshot module to improve coverage.

Checklist:

• I have performed a self-review of my own code to ensure there are no formatting, pep8, linting, or security issues
• I have performed Ansible Sanity test using --docker default
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Backward compatibility is not broken

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• Unit Test
• Functional Test

[ansible-collections-svc]

Can one of the admins verify this patch?

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 99.71182% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.41%. Comparing base (ed16885) to head (d92decc).

Files with missing lines	Patch %	Lines
plugins/modules/snapshot.py	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
+ Coverage   86.09%   86.41%   +0.32%     
==========================================
  Files         139      145       +6     
  Lines       15357    16067     +710     
  Branches     2232     2297      +65     
==========================================
+ Hits        13221    13884     +663     
- Misses       1493     1517      +24     
- Partials      643      666      +23     

Flag	Coverage Δ
units	86.41% <99.71%> (+0.32%)	⬆️

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[sachin-apa]

Approved as the Integration tests are passing for the modules on the changes done