Update manage-issue.yml

[saade]

Url can be null as defined in

filament/.github/workflows/manage-issue.yml

Line 34 in 9f2f63a

const url = urlMatch !== null ? urlMatch[1].trim() : null

Because of that, its causing errors while evaluating NO_REPRO_URL further down in the code, see action log:
https://github.com/filamentphp/filament/actions/runs/7005326321

This PR fixes the evaluation by adding a check wether url is not falsy.

Also fixes the checks for repro urls under filamentphp org to avoid urls like:
#9838

const url = 'https://github.com/filamentphp/demo'

// before
((! url.includes('https://github.com/')) || url.includes('https://github.com/filamentphp/') || url === 'https://github.com/filamentphp') && (! url.includes('https://github.com/filamentphp/demo')) // false

// after
((! url) || (! url.includes('https://github.com/')) || (url.includes('https://github.com/filamentphp'))) // true

[danharrin]

We want to allow filamentphp/demo but deny filamentphp/filament