fix: clarify app setup messages and hint about jbang version --update

[maxandersen]

When jbang app setup detects JBang is already on PATH, the messages now:

1. Clarify that --force updates shell environment files (not JBang itself)
2. Suggest running jbang version --update to update JBang itself

Before:

[jbang] JBang is already available in PATH.
[jbang] (You can use --force to perform the setup anyway)

After:

[jbang] JBang is already available in PATH.
[jbang] (You can use --force to update your shell environment files anyway)
[jbang] If you want to update JBang itself, run: jbang version --update

Fixes #2067

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[quintesse]

LGTM

[koppor]

Not sure whether you like my proposal at maxandersen#9

[maxandersen]

sorry @koppor didnt see it was you opened PR on my fork not jbangdev/jbang :)

added you as co-author on this one. thanks!

[koppor]

Thank you. In that moment I totally forgot that there was the suggestion functionality 😅