fix: sequence table next value acl permission to writer role

[harshit-gangal]

Description

For Select and Union queries, Vitess only checks for read permission on vttablet.
This PR changes to check on write permission for the Next Value of sequence table calls.

Related Issue(s)

• Fixes Bug Report: Read only user modifying sequence table value #16510

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

All modified and coverable lines are covered by tests ✅

Project coverage is 68.74%. Comparing base (2e79d16) to head (1fa9194).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16509      +/-   ##
==========================================
- Coverage   68.75%   68.74%   -0.01%     
==========================================
  Files        1556     1556              
  Lines      199699   199704       +5     
==========================================
- Hits       137300   137295       -5     
- Misses      62399    62409      +10     

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[GuptaManan100]

Good catch!