Git tokens need some good masking/trimming in places

[a-roberts]

Hey folks! So this is doing a quickstart - we went with the Go one FWIW.

Version is 3.0658.

Three things spotted...

1. When prompted for a token to use, mask the input please 😄 I know it is masked when we do a command or two under the covers
2. Trim the input (we had whitespace, oops, resulted in %20 of course which isn't gonna work)
3. Mask the token in the error output too please

(p.s, I think I implemented this for jx 2...waaaay back in the day...update - ah, no, it was for rhd-gitops-example/services#26 - so some code there may be useful)

@jstrachan poke 😸

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