Update branch protection instructions for different GitHub versions

[ashis-baral]

Why:

Closes: #45656

What's being changed (if available, include any code snippets, screenshots, or gifs):

Updates the Creating a branch protection rule instructions to use version-specific text for the repository settings sidebar.

"Code, planning, and automation" for GitHub Free, Pro, Team (FPT), and GitHub Enterprise Cloud (GHEC).

"Code and automation" for GitHub Enterprise Server (GHES).

This change ensures that the documentation matches the UI for each GitHub version and helps users locate the Branches settings when following the instructions.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Table of review links

Note: Please update the URL for your staging server or codespace.

The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
repositories/configuring-branches-and-merges-in-your-repository/managing-protected-branches/managing-a-branch-protection-rule.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17	from reusable
repositories/configuring-branches-and-merges-in-your-repository/managing-rulesets/converting-branch-protections-to-rulesets.md	fpt ghec	fpt ghec	from reusable

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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