chore: Replace campsite.co with campsite.com

[nholden]

What does this PR do?

Campsite has a new domain name! This PR updates references in the Campsite integration code.

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have added a Docs issue here if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox. N/A
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

N/A. We're serving the same application from [auth/api].campsite.co and [auth/api].campsite.com, so this will work!

[vercel]

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[graphite-app]

Graphite Automations

"Add consumer team as reviewer" took an action on this PR • (09/25/24)

1 reviewer was added to this PR based on Keith Williams's automation.

"Add community label" took an action on this PR • (09/25/24)

1 label was added to this PR based on Keith Williams's automation.

"Add ready-for-e2e label" took an action on this PR • (09/25/24)

1 label was added to this PR based on Keith Williams's automation.

[github-actions]

E2E results are ready!

• Workflow #32923.2 latest results