Remove `AnalyzeUseNewUpload` FF and make its behaviour the default #6530

Job	Run time
Go: tracing with custom build steps (ubuntu-latest, stable-v2.19.4)	1m 17s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.18.4)	1m 5s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.22.4)	1m 13s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.17.6)	1m 0s
Go: tracing with custom build steps (macos-latest, stable-v2.19.4)	2m 11s
Go: tracing with custom build steps (macos-latest, stable-v2.22.4)	3m 12s
Go: tracing with custom build steps (macos-latest, linked)	3m 8s
Go: tracing with custom build steps (macos-latest, stable-v2.17.6)	2m 45s
Go: tracing with custom build steps (macos-latest, stable-v2.18.4)	2m 42s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.21.4)	1m 10s
Go: tracing with custom build steps (macos-latest, default)	3m 0s
Go: tracing with custom build steps (ubuntu-latest, nightly-latest)	56s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.20.7)	1m 3s
Go: tracing with custom build steps (ubuntu-latest, default)	59s
Go: tracing with custom build steps (macos-latest, stable-v2.21.4)	3m 20s
Go: tracing with custom build steps (ubuntu-latest, linked)	59s
Go: tracing with custom build steps (macos-latest, stable-v2.20.7)	3m 19s
Go: tracing with custom build steps (macos-latest, nightly-latest)	3m 2s
	36m 21s

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