[dashboard] fix handling of incomplete referrer

[laushinka]

Fixes #4701

I investigated the issue and found that it is not possible to retrieve the referrer information from Safari, even though the information is available in the request header.
Therefore what I did instead was fix the handling in FromReferrer.tsx, by showing the intended text when we don't have a complete referrer URL.
I also adjusted the text a little bit - please let me know if the new text is acceptable.

[JanKoehnlein]

Thank you, this looks good codewise. Is it possible to test this (manually) and if so, could you provide the steps?

[JanKoehnlein]

/cc @JanKoehnlein

[laushinka]

Thank you, this looks good codewise. Is it possible to test this (manually) and if so, could you provide the steps?

Yes. These are the steps:

1. Have the staging URL ready.
2. On Safari, go to https://github.com/gitpod-io/gitpod.
3. Inspect the "ready-to-code" href element, which should be "https://gitpod.io/from-referrer/".
4. Change "https://gitpod.io" to the staging URL. It should then look something like "https://some-url.staging.gitpod-dev.com/from-referrer/"
5. Click on the "ready-to-code" button and see it happen.

[JanKoehnlein]

/lgtm

[roboquat]

LGTM label has been added.

Git tree hash: 80bebeab998f47168956f0c692ac2245452de218

[roboquat]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JanKoehnlein

Associated issue: #4701

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[JanKoehnlein]

Congrats, @laushinka: Your first PR has been merged to Gitpod main!