Remove testBuildType mechanism from UI test modules

[runningcode]

Summary

• Disable the debug variant unconditionally in sentry-uitest-android and sentry-uitest-android-benchmark since debug and release were configured identically (same minification, proguard rules, signing)
• Hardcode testBuildType = "release" and remove the -DtestBuildType=release system property mechanism
• Combine separate Gradle invocations into single commands in the Makefile and docs

#skip-changelog

🤖 Generated with Claude Code

[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.41.0 (1)	release

⚙️ sentry-android Build Distribution Settings

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	307.98 ms	327.92 ms	19.94 ms
Size	0 B	0 B	0 B

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
5865051	319.74 ms	365.60 ms	45.86 ms
0220a5c	452.20 ms	479.33 ms	27.12 ms
2124a46	319.19 ms	415.04 ms	95.85 ms
2195398	322.52 ms	361.91 ms	39.39 ms
bbc35bb	298.53 ms	372.17 ms	73.64 ms
d364ace	382.77 ms	443.21 ms	60.44 ms
d15471f	379.40 ms	470.76 ms	91.36 ms
9139b91	351.35 ms	355.63 ms	4.28 ms
fc5ccaf	322.49 ms	405.25 ms	82.76 ms
52feca7	314.77 ms	378.67 ms	63.90 ms

App size

Revision	Plain	With Sentry	Diff
5865051	0 B	0 B	0 B
0220a5c	0 B	0 B	0 B
2124a46	1.58 MiB	2.12 MiB	551.51 KiB
2195398	0 B	0 B	0 B
bbc35bb	1.58 MiB	2.12 MiB	553.01 KiB
d364ace	1.58 MiB	2.11 MiB	539.75 KiB
d15471f	1.58 MiB	2.13 MiB	559.54 KiB
9139b91	1.58 MiB	2.13 MiB	559.52 KiB
fc5ccaf	1.58 MiB	2.13 MiB	557.54 KiB
52feca7	0 B	0 B	0 B

[0xadam-brown]

Claude tells me:

The debug and release build types in this PR's two uitest modules were configured identically (same minification, same proguard rules, same signing config), and every
single call site always passed -DtestBuildType=release to override the default. The System.getProperty("testBuildType", "debug") mechanism gave the appearance of a configurable choice, but in practice nobody ever used it as "debug" — it was dead flexibility.

The PR removes that indirection so the build config matches how it was actually used.

Good deal 👍

[runningcode]

Yup that's correct. In addition, it also increases build times and cache sizes because if you switch variants then you have to rebuild it.