Remove unnecessary sleep after pg_ctl start in test suite #1086

Job	Run time
Build (x86_64-linux)	3m 24s
Build (x86_64-linux-musl)	3m 5s
Build (arm64-darwin)	4m 11s
Build (aarch64-linux-musl)	2m 56s
Build (x86_64-darwin)	4m 19s
Build (x64-mingw-ucrt)	5m 49s
Build (x64-mingw32)	4m 22s
Build (aarch64-linux)	3m 27s
GLIBC (x86_64-linux)	3m 17s
multiarch (x86_64-linux-musl on alpine linux/x86_64)	54s
yugabyte (x86_64-linux	1m 46s
multiarch (aarch64-linux on alpine linux/arm64)	57s
multiarch (aarch64-linux-musl on alpine linux/arm64)	1m 2s
Test (macos-15-intel, 4.0, x86_64-darwin)	1m 54s
multiarch (x86_64-linux on fedora:39 linux/x86_64)	1m 35s
Test (macos-latest, 3.0, arm64-darwin)	1m 18s
Test (macos-latest, 4.0, arm64-darwin)	1m 7s
Test (windows-latest, 3.2, x64-mingw-ucrt, 16.6-1-windows-x64)	5m 29s
Test (windows-latest, 4.0, x64-mingw-ucrt)	5m 15s
Test (ubuntu-24.04-arm, 3.0, aarch64-linux)	1m 29s
Test (ubuntu-24.04-arm, 4.0, aarch64-linux)	1m 28s
multiarch (x86_64-linux on alpine linux/x86_64)	50s
Test (macos-15-intel, 3.0, x86_64-darwin)	2m 20s
Test (ubuntu-latest, 4.0, x86_64-linux)	1m 6s
Test (ubuntu-latest, 3.0, x86_64-linux)	1m 9s
	1h 4m 29s

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