[dashboard] fix host value for Git Integrations

[AlexTugarev]

if : is included, just the preview of the callback URL should be replaced with _, but not actual host value.

Description

Related Issue(s)

Aftermath of #11798

How to test

1. When entering a host value for a new integration on Git Integration page with a colon included, e.g. example.com:8433, you should see:

• example.com:8433 in host field
• .../example.com_8433/callback in preview of the callback URL

2. Try to use an actual host with a reachable port (but it doesn't has to be a real OAuth2 server running) and hit Activate Integration.

• (ignoring the request error for non-existing OAuth2 server) verify that your browser got redirected to an URL with example.com:8433 as host and containing example.com_8433 in the query.

Release Notes

Fixes entering of colons in host on Git Integration page.

Documentation

Werft options:

• /werft with-preview

[AlexTugarev]

/werft run

👍 started the job as gitpod-build-at-fix-host.1
(with .werft/ from main)

[werft-gitpod-dev-com]

started the job as gitpod-build-at-fix-host.2 because the annotations in the pull request description changed
(with .werft/ from main)

[andrew-farries]

Is it possible to add some tests for this? ie, turn the comment here into a test?

/hold

[AlexTugarev]

@andrew-farries, thanks for the nudge! done.

/hold cancel