fix issue with multiple release notes

[harjotgill]

Summary by CodeRabbit

- Refactor: Updated `DESCRIPTION_START_TAG` constant to be a string and optimized the `removeContentWithinTags` function in `src/commenter.ts`.
- Documentation: Updated product name from "Professional Version of CodeRabbit" to "CodeRabbit Pro" in README.md and src/review.ts.
- New Feature: Announced that CodeRabbit Pro is now free for open source projects, as reflected in src/review.ts.

[github-actions]

CodeRabbit

Walkthrough

This update primarily focuses on rebranding the product name from "Professional Version of CodeRabbit" to "CodeRabbit Pro". It also includes minor tweaks in src/commenter.ts for better string handling and formatting. The changes are straightforward and do not alter the core functionality of the code.

Changes

File	Summary
README.md, src/review.ts	Updated the product name from "Professional Version of CodeRabbit" to "CodeRabbit Pro". Added a note in src/review.ts stating that CodeRabbit Pro is free for open source projects.
src/commenter.ts	Modified the DESCRIPTION_START_TAG constant to be a string instead of a template literal. Updated the removeContentWithinTags function to use lastIndexOf instead of indexOf when finding the end tag. Added newline characters before and after the release notes message in the newDescription variable.

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[github-actions]

CodeRabbit

Commits

Files that changed from the base of the PR and between d7f9486 and 8691fb5 commits.

Files selected (1)

• src/commenter.ts (3)

Files ignored due to filter (1)

• dist/index.js

Files skipped from review due to trivial changes (1)

• src/commenter.ts

Review comments generated (0)

• Review: 0
• LGTM: 0

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[github-actions]

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Commits

Files that changed from the base of the PR and between 8691fb5 and d2cfadc commits.

Files selected (2)

• README.md (1)
• src/review.ts (1)

Files ignored due to filter (1)

• dist/index.js

Files skipped from review due to trivial changes (1)

• src/review.ts

Review comments generated (1)

• Review: 0
• LGTM: 1

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• Reply on review comments left by this bot to ask follow-up questions. A review comment is a comment on a diff or a file.
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Code suggestions

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Pausing incremental reviews

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