chore: remove generate msi task

[fmenezes]

Proposed changes

This PR simplifies and improves the Windows package building process for the MongoDB Atlas CLI. It moves away from using a dedicated MSI build task in Evergreen to a more integrated approach with GoReleaser.

Changes:

• Removed the separate MSI packaging task - Eliminated the standalone package_msi task and its associated variant in Evergreen
• Integrated MSI building into GoReleaser - Modified the GoReleaser workflow to handle MSI generation as part of the regular build process (hook after generating .exe)
• Reorganized MSI-related files - Moved MSI templates and build scripts into msi folder
• MSI file now contain signed executable - Previously, MSIs contained unsigned versions of the .exe files, now they include the properly signed versions

Jira ticket: CLOUDP-#

Closes #[issue number]

Checklist

• I have signed the MongoDB CLA
• I have added tests that prove my fix is effective or that my feature works
• I have added any necessary documentation in document requirements section listed in CONTRIBUTING.md (if appropriate)
• I have addressed the @mongodb/docs-cloud-team comments (if appropriate)
• I have updated test/README.md (if an e2e test has been added)
• I have run make fmt and formatted my code

Further comments

[github-actions]

Coverage Report 📈

Branch	Commit	Coverage
master	c6609e9	25.1%
chore_remove_msi_task	77e5fe3	25.1%
	Difference	0%