Find pyenv path from build agent #3275

Job	Run time
Lint for Docs	19s
Linux	14m 33s
Bazel Linux	8m 45s
macOS	13m 16s
Bazel macOS arm64	1s
Bazel macOS	18m 2s
Build Number	0s
Lint	9m 9s
Bazel Windows	14m 49s
Wheel 3.7 Linux	1m 4s
Wheel 3.8 Linux	1m 48s
Wheel 3.9 Linux	1m 3s
Wheel 3.10 Linux	1m 3s
Wheel 3.11 Linux	1m 4s
Test 3.8 Linux	6m 54s
Test 3.9 Linux	6m 35s
Nightly ${{ matrix.python }} Linux	0s
Wheel ${{ matrix.python }} Windows	0s
Test ${{ matrix.python }} Windows	0s
Nightly ${{ matrix.python }} Windows	0s
Wheel 3.7 macOS	54s
Wheel 3.8 macOS	53s
Wheel 3.9 macOS	57s
Wheel 3.10 macOS	47s
Wheel 3.11 macOS	1m 0s
Test 3.8 macOS	38m 32s
Test 3.9 macOS	38m 17s
Nightly ${{ matrix.python }} macOS	0s
Release	0s
Nightly	0s
Docker Nightly	0s
Release Candidate	0s
Docker Release	0s
Wheel ${{ matrix.python }} macOS arm64	0s
	2h 59m 45s

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