chore: Update gPRC documentation

[dipinknair]

Update whatsnew with gRPC development and banner because of breaking change.

New doc : https://mechanical.docs.pyansys.com/pull/1469/

[codecov]

Codecov Report

❌ Patch coverage is 31.25000% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.08%. Comparing base (70c65ae) to head (7cec024).

❌ Your patch check has failed because the patch coverage (31.25%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1469      +/-   ##
==========================================
- Coverage   80.32%   80.08%   -0.24%     
==========================================
  Files          42       42              
  Lines        3197     3209      +12     
==========================================
+ Hits         2568     2570       +2     
- Misses        629      639      +10     

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[github-actions]

The documentation for this pull request will be available at https://mechanical.docs.pyansys.com/pull/1469. Please allow some time for the documentation to be deployed.

I will have to make more changes after discussion with Sami.

[codacy-production]

Not up to standards ⛔

🔴 Issues 4 minor

Alerts:
⚠ 4 issues (≤ 0 issues of at least minor severity)

Results:
4 new issues

Category	Results
Documentation	4 minor

View in Codacy

🟢 Metrics 5 complexity

Metric	Results
Complexity	5

View in Codacy

🟢 Coverage 31.25% diff coverage · -0.24% coverage variation

Metric	Results
Coverage variation	✅ -0.24% coverage variation (-1.00%)
Diff coverage	✅ 31.25% diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (70c65ae)	3197	2568	80.33%
Head commit (7cec024)	3209 (+12)	2570 (+2)	80.09% (-0.24%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1469)	16	5	31.25%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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