perf(ci): cache Gradle state and drop duplicate release builds and add re-run for failed assemble

[alperozturk96]

Before

Assemble / flavor (Huawei) (pull_request) Successful in 37m

After

[Assemble / flavor (Huawei) (pull_request)]
https://github.com/nextcloud/android/actions/runs/34952208947/job/104325594424?pr=17643 Successful in 17m

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI (N/A)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[github-actions]

📱 QA build

Download	app-qa-debug.apk (19M)
QR code	Open the QR code for this download
Commit	6e72b64
Version	17643
Available until	7 days after this build

The QA build installs alongside a released Nextcloud app, so you can keep
using your existing install while testing.

Downloading the file requires a GitHub account, so open this link on the
device you want to test on, or transfer the APK to it.

[tobiasKaminsky]

With caching this should be faster, right?

I tried something similar here:
#16224

But it is also not fast(er).

[alperozturk96]

With caching this should be faster, right?

I tried something similar here: #16224

But it is also not fast(er).

Second run and yes not that much difference. Nevertheless this excludes release builds.

[github-actions]

Codacy

SpotBugs

Category	Base	New
Bad practice	32	32
Correctness	58	58
Dodgy code	186	186
Experimental	1	1
Malicious code vulnerability	2	2
Multithreaded correctness	26	26
Performance	37	37
Security	18	18
Total	360	360