feat: Implement Automatic Configuration Backup during re-installs or upgrades

[Nandu-pns]

Jira - https://new-relic.atlassian.net/browse/NR-520229

This PR implements an automatic, fail-safe configuration backup system that runs before any recipe is executed.

What changed

New package: internal/install/backup/

Test Results

Test Results have been updated here

[codecov]

Codecov Report

❌ Patch coverage is 42.43208% with 445 lines in your changes missing coverage. Please review.
✅ Project coverage is 32.03%. Comparing base (4ed200d) to head (adf6459).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/install/backup/restorer.go	0.00%	131 Missing ⚠️
internal/install/backup/detector.go	57.92%	66 Missing and 3 partials ⚠️
internal/install/command.go	8.00%	69 Missing ⚠️
internal/install/backup/creator.go	65.00%	42 Missing and 14 partials ⚠️
internal/install/backup/orchestrator.go	48.42%	43 Missing and 6 partials ⚠️
internal/install/backup/lifecycle.go	59.43%	29 Missing and 14 partials ⚠️
internal/install/recipe_installer.go	35.00%	19 Missing and 7 partials ⚠️
internal/install/ux/spinner_progress_indicator.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1793      +/-   ##
==========================================
+ Coverage   31.30%   32.03%   +0.73%     
==========================================
  Files         181      186       +5     
  Lines       12551    13322     +771     
==========================================
+ Hits         3929     4268     +339     
- Misses       8478     8870     +392     
- Partials      144      184      +40     

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