feat: add support for env files at ws and exec level

[jahvon]

This pull request adds support for loading environment variables from .env files at both the workspace and executable parameter levels. It introduces new configuration options, updates documentation and schemas, and includes comprehensive tests for the new functionality.

[codecov]

Codecov Report

❌ Patch coverage is 68.26923% with 33 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/utils/env/env.go	76.92%	13 Missing and 5 partials ⚠️
cmd/internal/exec.go	42.30%	10 Missing and 5 partials ⚠️

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