feat: make non-interactive the default mode of guided remediation

[cuixq]

This PR makes non-interactive the default mode for guided remediation:

• adds --interactive flag for the interactive mode;
• deprecates --non-interactive flag;
• updates tests and docs accordingly.

Also moves guided remediation from experimental.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 30.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 64.57%. Comparing base (583531a) to head (c7a2b75).
Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/osv-scanner/fix/main.go	25.00%	5 Missing and 1 partial ⚠️
cmd/osv-scanner/fix/interactive.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1670      +/-   ##
==========================================
- Coverage   64.57%   64.57%   -0.01%     
==========================================
  Files         156      156              
  Lines       15980    15981       +1     
==========================================
  Hits        10319    10319              
- Misses       4979     4981       +2     
+ Partials      682      681       -1     

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