feat: increase team subscription to $8

[tianrunhe]

Description

Fixes #9707

Demo

• Here's the new price in Stripe test
• Here's the new price in Stripe prod

Testing scenarios

• Team tier upgrade
  • Create a new org & a new team
  • Try to upgrade the org to team tier, observe the text is correctly updated from $6 to $8
  • Upgrade and make sure it works
  • Go to Stripe and verify the customer is correctly setup with the new $8 subscription (price app id: parabol-pro-800)

Final checklist

• I checked the code review guidelines
• I have added Metrics Representative as reviewer(s) if my PR invovles metrics/data/analytics related changes
• I have performed a self-review of my code, the same way I'd do it for any other team member
• I have tested all cases I listed in the testing scenarios and I haven't found any issues or regressions
• Whenever I took a non-obvious choice I added a comment explaining why I did it this way
• I added the label Skip Maintainer Review Indicating the PR only requires reviewer review and can be merged right after it's approved if the PR introduces only minor changes, does not contain any architectural changes or does not introduce any new patterns and I think one review is sufficient'
• PR title is human readable and could be used in changelog

[Dschoordsch]

Works as expected. I did not verify the prod stripe settings.

One thing I noticed, also on master: when upgrading, I see the fireworks, but the buttons stays in the loading state "upgrading..." and I have to refresh the page to see the new invoice and setting. Do we already have an issue for this?