support navigation with branch search param

[icaraps]

Fix #53

Test URLs:

• Before: https://main--prisma-cloud-docs-website--hlxsites.hlx.page/prisma/prisma-cloud/en/compute/pcee/admin-guide/access-control/rbac?branch=ian-add-file
• After: https://branch-search-param-v2--prisma-cloud-docs-website--hlxsites.hlx.page/prisma/prisma-cloud/en/compute/pcee/admin-guide/access-control/rbac?branch=ian-add-file

Click on Prisma Cloud Operationalize Guide > Phases > Test and you should land on a page with test content

[aem-code-sync[bot]]

Hello, I'm Franklin Bot and I will run some test suites that validate the page speed. In case there are problems, just click the checkbox below to rerun the respective action.

• [ ] Re-run PSI Checks

[aem-code-sync[bot]]

Page	Scores	Audits	Google
/prisma/prisma-cloud/en/compute/pcee/admin-guide/access-control/rbac?branch=ian-add-file