Update ADR list and add ADR for workspace use

[dms1981]

A reference to the issue / Description of it

#8960

How does this PR fix the problem?

It doesn't, but it does document the decision

How has this been tested?

N/A

Deployment Plan / Instructions

N/A

Checklist (check x in [ ] of list items)

• I have performed a self-review of my own code
• All checks have passed
• I have made corresponding changes to the documentation
• Plan and discussed how it should be deployed to PROD (If needed)

Additional comments (if any)

{Please write here}

[github-actions]

Trivy Scan Success

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Trivy will check the following folders:

</details> #### `Checkov Scan` Success
<details><summary>Show Output</summary>

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Checkov will check the following folders:

CTFLint Scan Success

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Setting default tflint config...
Running tflint --init...
Installing "terraform" plugin...
Installed "terraform" (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.9.1)
tflint will check the following folders:

Trivy Scan Success

Show Output

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Trivy will check the following folders:

[Khatraf]

lgtm