ci: Replace curl-pipe-bash with action-setup-cli for Sentry CLI setup

[oioki]

Summary

• Two "Install Sentry CLI" steps (build.yml, integration-tests-ui.yml) used curl -sL https://sentry.io/get-cli/ | bash, piping a remote install script directly into a shell.
• Replaced both with getsentry/action-setup-cli, which downloads the sentry-cli release asset for the runner's OS/arch and verifies its sha256 against the digest GitHub recorded for that asset via the Releases API, before adding it to PATH. Uses gh only, no curl.
• Preserved the existing if: condition on the integration-tests-ui.yml step.

Test plan

• Validated both workflow files parse correctly
• Verify both jobs still install sentry-cli and upload snapshots correctly on this PR

Fixes VULN-2261

🤖 Generated with Claude Code

[linear-code]

VULN-2261

[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.52.0 (1)	release

⚙️ sentry-android Build Distribution Settings

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	462.14 ms	471.67 ms	9.53 ms
Size	0 B	0 B	0 B

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
d15471f	303.49 ms	439.08 ms	135.59 ms
b750b96	408.98 ms	480.32 ms	71.34 ms
17a0955	372.53 ms	446.70 ms	74.17 ms
d217708	355.34 ms	381.39 ms	26.05 ms
5b1a06b	310.56 ms	362.79 ms	52.22 ms
fcec2f2	311.35 ms	384.94 ms	73.59 ms
62b579c	349.26 ms	426.26 ms	77.00 ms
5f14e5d	325.76 ms	368.32 ms	42.56 ms
48277cd	320.38 ms	379.90 ms	59.52 ms
a416a65	295.53 ms	373.74 ms	78.21 ms

App size

Revision	Plain	With Sentry	Diff
d15471f	1.58 MiB	2.13 MiB	559.54 KiB
b750b96	1.58 MiB	2.10 MiB	533.19 KiB
17a0955	1.58 MiB	2.10 MiB	533.20 KiB
d217708	1.58 MiB	2.10 MiB	532.97 KiB
5b1a06b	0 B	0 B	0 B
fcec2f2	1.58 MiB	2.12 MiB	551.51 KiB
62b579c	0 B	0 B	0 B
5f14e5d	1.58 MiB	2.19 MiB	620.00 KiB
48277cd	0 B	0 B	0 B
a416a65	1.58 MiB	2.12 MiB	555.26 KiB