ci: Remove VLC tests

[philipphofmann]

Remove cause dependency of VLC doesn't exist anymore on GH https://github.com/levigroker/GRKArrayDiff.

Issue to eventually enable them again #2613.

https://github.com/getsentry/sentry-cocoa/actions/runs/3931628135/jobs/6724030804

[!] Automatically assigning platform `iOS` with version `12.2` on target `VLC-iOS-Screenshots` because no platform was specified. Please specify a platform for this target in your Podfile. See `[https://guides.cocoapods.org/syntax/podfile.html#platform`.](https://guides.cocoapods.org/syntax/podfile.html#platform%60.)

[!] Error installing GRKArrayDiff
[!] /usr/local/bin/git clone https://github.com/levigroker/GRKArrayDiff.git /var/folders/[24](https://github.com/getsentry/sentry-cocoa/actions/runs/3931628135/jobs/6724030804#step:6:25)/8k48jl6d249_n_qfxwsl6xvm0000gn/T/d20230116-997-15y3pj --template= --single-branch --depth 1 --branch 2.2.2

Cloning into '/var/folders/24/8k48jl6d249_n_qfxwsl6xvm0000gn/T/d20230116-997-15y3pj'...
fatal: could not read Username for 'https://github.com/': Device not configured
Error: Process completed with exit code 1.

#skip-changelog