VTGate: Session in StreamExecute response as default

[harshit-gangal]

Description

This PR enables grpc-send-session-in-streaming as true by default and mark the flag as deprecated to be removed from future release.

Related Issue(s)

• Follow up from Add session flag for stream execute grpc api #14046
• Deprecation Follow-up Work for v22.0 Code Freeze #17734

Checklist

• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 67.54%. Comparing base (3657ad2) to head (9b777a3).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
go/vt/vtgate/grpcvtgateservice/server.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17907      +/-   ##
==========================================
+ Coverage   67.50%   67.54%   +0.04%     
==========================================
  Files        1597     1597              
  Lines      259761   259770       +9     
==========================================
+ Hits       175344   175456     +112     
+ Misses      84417    84314     -103     

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[deepthi]

Do we have an issue created for what needs to be done in v23?

[GuptaManan100]

LGTM. Deepthi's comment needs to be addressed.

[harshit-gangal]

grpc-send-session-in-streaming

Issue exists now #17913