fix: pro plan paths

[AdityaHegde]

There were some paths to pro plan that were incorrect.

1. All Upgrade to pro/renew should automatically redirect to stripe checkout page if there are payment issues.
2. Hitting Upgrade to pro should be a single step, redirect back from stripe checkout should start the upgrade instead of showing the modal again.
3. Show Payment module for only self managed plans like Pro/Team plans.
4. Estimates for usage for pro and trial plans can be incorrect. Remove them for now until backend API is available.

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!