CCM-5100: Backport suggested changes to template repo

[m-houston]

Description

During development on the IAM AuthN PoC several issues were encountered running the scripts from the template repo, both pre-commit hooks and deployment related.

This PR contains the proposed changes which may be useful to include in the template.

• Update terraform version to 1.8.5
• Init terraform environments before validating
• Fix _terraform helper function in Makefile for non-bash shells
• Remove hidden directories from vscode config
• Change hooks to use branch checks rather than just staged changes
• Spelling and dictionary tweaks

Context

• Running on M1 Mac
• Should be tested on Windows

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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Sensitive Information Declaration

To ensure the utmost confidentiality and protect your and others privacy, we kindly ask you to NOT including PII (Personal Identifiable Information) / PID (Personal Identifiable Data) or any other sensitive data in this PR (Pull Request) and the codebase changes. We will remove any PR that do contain any sensitive information. We really appreciate your cooperation in this matter.

• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.

[RossBugginsNHS]

Is there any better option than what we've done to set the envvar using /usr/bin/env? Not sure if there is a better option? are we going to flip flop on this if this doesn't work elsewhere?