feat: Add Target Modules Env Variable

[ishaansehgal99]

Reason for Change:

• Add env variable for custom target_modules

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 60.83%. Comparing base (45e75aa) to head (c4eaeb6). Report is 6 commits behind head on main.

Files	Patch %	Lines
pkg/tuning/preset-tuning.go	0.00%	8 Missing :warning:
pkg/resources/manifests.go	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #489 +/- ## ========================================== - Coverage 60.92% 60.83% -0.10% ========================================== Files 29 29 Lines 2559 2576 +17 ========================================== + Hits 1559 1567 +8 - Misses 909 918 +9 Partials 91 91 ```

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