feat: add support for n.x.x versions

[LeahMarieBush]

Description

Monday task

This PR adds support for double 'x' versions in dev-portal. There is a partner PR that will be merged around the same time as this one for UDR here.

The main changes in this PR are as follows:

• Adds double 'x' version regex in all the spots that the normal version regex is used
• Adds tests for the double 'x' version

Testing

This PR needs to be tested with the changes for UDR. Without those changes, the ones in this PR will not work. You will need to locally run UDR and dev-portal to see these changes reflected.

First, do the steps in UDR:
UDR:

1. Checkout leah/feat/n.x.x-version-support
2. Go to vault and create a few new versions. You can do this by copying the latest version folder and pasting it and then changing the name. For testing the sorting, use a variety of version names (ex. v2.x.x, v3.x.x, v4.x.x (rc), v5.x.x (beta))
3. Run npm run prebuild
4. After that finishes, run npm run dev

Then do the steps in dev-portal:
Dev-portal:

1. Checkout leah/feat/n.x.x-version-support
2. In the .env file, change the UNIFIED_DOCS_API to http://localhost:8080
3. Run npm start
4. Go to http://localhost:3000 and click through the vault docs. Verify the new double 'x' versions are sorted properly with the existing versions and look as expected

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Project	Deployment	Actions	Updated (UTC)
dev-portal	Ready	Preview, Comment	Apr 2, 2026 4:17pm

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