chore: Update workflow to fetch labels using github API

[itaybre]

Looks like GH actions events may be missing the PR labels.

This PR fetch them manually instead of depending on the obtained data

Closes #6722

[codecov]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
3938	2	3936	55

View the top 3 failed test(s) by shortest run time

SentryCrashBinaryImageCacheTests::testRemoveImageAddAgain

Stack Traces | 0s run time

.../SentryTests/SentryCrash/SentryCrashBinaryImageCacheTests.m:317 - *** -[__NSArrayM objectAtIndexedSubscript:]: index 4 beyond bounds [0 .. 3] (NSRangeException)

SentryCrashMachineContextTests::testGetContextForThread_WithManyThreads

Stack Traces | 0s run time

.../SentryTests/SentryCrash/SentryCrashMachineContextTests.m:66 - ((threadIndex >= 0) is true) failed - Thread should be found in the list

iOS_SwiftUI_UITests.FeedbackUITests::testWidgetDisplayInSwiftUIApp

Stack Traces | 0s run time

.../iOS-SwiftUI/iOS-SwiftUI-UITests/FeedbackUITests.swift:14 - Failed to get matching snapshots: Timed out while evaluating UI query.

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1192.58 ms	1219.68 ms	27.10 ms
Size	23.75 KiB	1.00 MiB	1001.52 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
854ca12	1219.94 ms	1251.32 ms	31.38 ms
a6f5396	1211.81 ms	1245.63 ms	33.82 ms
d637379	1226.43 ms	1250.77 ms	24.34 ms
4a7a005	1229.15 ms	1243.35 ms	14.20 ms
d48a247	1243.59 ms	1273.27 ms	29.67 ms
079bcc8	1217.88 ms	1234.88 ms	17.00 ms
1fecbb8	1242.78 ms	1265.40 ms	22.62 ms
acac774	1217.76 ms	1253.29 ms	35.52 ms
2a6f451	1212.89 ms	1237.45 ms	24.56 ms
75b23cd	1227.10 ms	1253.61 ms	26.51 ms

App size

Revision	Plain	With Sentry	Diff
854ca12	23.74 KiB	996.96 KiB	973.22 KiB
a6f5396	23.75 KiB	989.12 KiB	965.38 KiB
d637379	23.75 KiB	855.38 KiB	831.63 KiB
4a7a005	23.75 KiB	979.96 KiB	956.22 KiB
d48a247	23.75 KiB	994.73 KiB	970.99 KiB
079bcc8	23.74 KiB	874.07 KiB	850.33 KiB
1fecbb8	23.75 KiB	969.28 KiB	945.53 KiB
acac774	23.75 KiB	866.51 KiB	842.76 KiB
2a6f451	23.75 KiB	913.13 KiB	889.38 KiB
75b23cd	23.75 KiB	933.66 KiB	909.92 KiB