fix(tools): remove terraform-exec

[arnaud-dezandee]

Fix #598

Changes made:

• Replaced terraform-exec library: Migrated from hashicorp/terraform-exec to direct os/exec commands
• Created shared base: New internal/runner/tools/base/base.go with BaseTool struct containing all common functionality

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 61.90476% with 24 lines in your changes missing coverage. Please review.

Project coverage is 48.94%. Comparing base (cd78aec) to head (f6369aa).

Files with missing lines	Patch %	Lines
internal/runner/tools/base/base.go	65.30%	11 Missing and 6 partials ⚠️
internal/runner/tools/opentofu/opentofu.go	0.00%	6 Missing ⚠️
internal/runner/tools/install.go	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #628      +/-   ##
==========================================
+ Coverage   48.48%   48.94%   +0.46%     
==========================================
  Files          80       81       +1     
  Lines        5924     5874      -50     
==========================================
+ Hits         2872     2875       +3     
+ Misses       2820     2769      -51     
+ Partials      232      230       -2     

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[corrieriluca]

When I read the output of the Unit tests job I don't see any tests ran in the runner package 🤔

That's strange, because we have tests in this area, I'm gonna check locally before merging.

	github.com/padok-team/burrito/internal/runner/tools		coverage: 0.0% of statements
	github.com/padok-team/burrito/internal/runner/tools/base		coverage: 0.0% of statements
	github.com/padok-team/burrito/internal/runner/tools/opentofu		coverage: 0.0% of statements
	github.com/padok-team/burrito/internal/runner/tools/terraform		coverage: 0.0% of statements
	github.com/padok-team/burrito/internal/runner/tools/terragrunt		coverage: 0.0% of statements

Edit: Actually it's okay, tests are associated with the runner package:

ok  	github.com/padok-team/burrito/internal/runner	16.720s	coverage: 64.4% of statements

[corrieriluca]

Nevertheless, thanks for your great contribution! 🚀