Fix exception raised from template should not show compiled code

[nikhilbhatt]

Motivation / Background

Fixes #51090

This Pull Request has been created to fix exceptions raised from template shows the compiled code.

Detail

This Pull Request changes activesupport/lib/active_support/core_ext/erb/util.rb

Additional information

1. In this tokenize method we are not handling the text present after %>
2. Updated that method to handle text present at end.

Checklist

Before submitting the PR make sure the following are checked:

• This Pull Request is related to one change. Changes that are unrelated should be opened in separate PRs.
• Commit message has a detailed description of what changed and why. If this PR fixes a related issue include it in the commit message. Ex: [Fix #issue-number]
• Tests are added or updated if you fix a bug or add a feature.
• CHANGELOG files are updated for the changed libraries if there is a behavior change or additional feature. Minor bug fixes and documentation changes should not be included.

[nikhilbhatt]

cc: @rafaelfranca

[nikhilbhatt]

@byroot could you review this?