Update json file loading to use loadJsonContent

[KevinRabun]

Overview/Summary

Updated json file loading to use loadJsonContent instead of json(loadTextContent. This approach allows for roughly 8x larger json files to be loaded by Bicep.

This PR fixes/adds/changes/removes

1. Fixes

Breaking Changes

1. Requires a version of Bicep that supports loadJsonContent

Testing Evidence

I made this change already in the SLZ variant of ALZ and successfully deployed the environment.

As part of this Pull Request I have

• [x ] Read the Contribution Guide and ensured this PR is compliant with the guide
• Ensured the resource API versions in .bicep file/s I am adding/editing are using the latest API version possible
• [x ] Checked for duplicate Pull Requests
• [x ] Associated it with relevant GitHub Issues
• (ALZ Bicep Core Team Only) Associated it with relevant ADO Items
• [x ] Ensured my code/branch is up-to-date with the latest changes in the main branch
• [x ] Performed testing and provided evidence.
• Updated one or more of the following tests (if required)
  • Unit
  • Linting
  • E2E (End-To-End)
  • ValidateAzCloud (Base validation in Azure Cloud)
  • ValidateMcCloud (Base validation in Azure China Cloud)
• [ x] Updated relevant and associated documentation (e.g. Contribution Guide, Module READMEs, Wiki Docs etc.)
• If relevant, created or updated Code Tours here

[ghost]

Hey KevinRabun, thanks for creating this PR.

We noticed that this PR is ammending some things related to policies (definitions or assignments) 🔍

Thanks for this however, please keep in mind we replicate all policies from our upstream repo https://github.com/Azure/Enterprise-Scale (via some GitHub Actions) into these Bicep modules.

So it may be that this PR may be closed and we ask you to re-submit the changes to the respective code in our other repo.

However, we will review and advise further anyway but this is just a friendly premptive message and reminder of how policies are used and updated in this repo.

Thanks from your friendly msft-bot.

[KevinRabun]

@jtracey93 I removed the files we spoke update and updated this PR. I'll keep an eye on the linter though to make sure it is happy.

[jtracey93]

/azp run validateazcloud

[azure-pipelines]

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