feat: add sync windows

[LucasMrqes]

This implements Sync Windows to burrito, strongly inspired by ArgoCD's Sync Windows.
Sync Windows enables the user to specify windows during which layers will never by planned or applied (deny windows), or to only plan (or apply) layers during specific windows (allow windows)

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 97.01493% with 2 lines in your changes missing coverage. Please review.

Project coverage is 44.50%. Comparing base (06834f4) to head (1902e7d).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/utils/syncwindow/syncwindow.go	96.36%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #531      +/-   ##
==========================================
+ Coverage   43.81%   44.50%   +0.69%     
==========================================
  Files          78       79       +1     
  Lines        5571     5644      +73     
==========================================
+ Hits         2441     2512      +71     
- Misses       2922     2923       +1     
- Partials      208      209       +1     

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[Copilot]

Pull Request Overview

This PR implements the sync windows feature for Burrito, allowing users to restrict or permit layer operations (plan/apply) based on defined time windows. The key changes include:

• Adding sync window definitions in manifests, CRDs, and configuration files.
• Implementing sync window logic and tests in the internal syncwindow package and controllers.
• Updating documentation and Helm charts to support and explain the new sync windows feature.

Reviewed Changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
mkdocs.yml	Added navigation entry for sync windows documentation (note a typo in the filename).
manifests/install.yaml	Added syncWindows field supporting type definitions for cron schedule, duration, layers, and actions.
manifests/crds/config.terraform.padok.cloud_terraformrepositories.yaml	Updated CRD to include syncWindows field with similar structure as install manifest.
internal/utils/syncwindow/syncwindow.go	Introduced sync window blocking logic based on active deny/allow windows.
internal/utils/syncwindow/syncwindow_test.go	Added comprehensive tests for various sync window scenarios.
internal/controllers/terraformlayer/states.go	Integrated sync window checks into the plan and apply action flows.
internal/controllers/terraformlayer/controller_test.go	Extended tests to cover sync window scenarios in reconciliation.
internal/burrito/config/*	Added default sync window configuration support and tests.
docs/user-guide/sync-windows.md	Created user guide documentation explaining sync windows usage.
deploy/charts/burrito/values.yaml	Added defaultSyncWindows configuration placeholder for Helm deployments.
api/v1alpha1/*	Updated CRD definitions and deepcopy methods to support syncWindows.

Files not reviewed (1)

• go.mod: Language not supported

Comments suppressed due to low confidence (1)

mkdocs.yml:43

• There appears to be a typo in the filename 'additionnal-trigger-path.md'. Consider renaming it to 'additional-trigger-path.md' for consistency.

    - user-guide/additionnal-trigger-path.md