Support disallowed nebari config changes

[Adam-D-Lewis]

Reference Issues or PRs

Fixes #2607
Probably best to start with src/_nebari/stages/terraform_state/init.py on the PR Reviews.

I decided to add the immutability check at the beginning of Stage 01 instead of between Stage 01 and Stage 02 as originally described in #2607 (comment).

What does this implement/fix?

Put a x in the boxes that apply

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

• Did you test the pull request locally?
• Did you add new tests?

Any other comments?

[dcmcand]

This is great @Adam-D-Lewis , Thanks. Works as advertised