Creating runfiles tree is very slow - because of hermetic Python

[apivovarov]

Hello Everyone
Couple month ago one commit was added to XLA main

Use hermetic Python in TSL and XLA
90a69e9

The issue is:

• It affects mlir/hlo tests time by several minutes (for "Creating runfiles trees" step)
• It uses gigabytes of disk space for duplicates of pypi_lit and python_x86_64-unknown-linux-gnu folders. Total 161,343 additional files

Command I used: bazel test //xla/mlir_hlo/tests/...

Before / After stats:

• Size of bazel-out/k8-opt/bin/xla/mlir_hlo/tests/Dialect/mhlo
  before: 40M
  after: 1.8G !!!

• Creating runfiles tree
  before: 1 second
  after: 110 seconds !!!

Content of typical xxx.mlir.test.runfiles folder:
Before (size 476K):
MANIFEST init.py llvm-project xla

After (size 22M):
MANIFEST  init.py  llvm-project  
pypi_lit  python_x86_64-unknown-linux-gnu  xla

MANIFEST number of lines
before: 101 lines
after: 4,815 lines

bazel test //xla/mlir_hlo/tests/... creates 63 xxx.mlir.test.runfiles folders containing the same copy of pypi_lit  and python_x86_64-unknown-linux-gnu  subfolders 

• python_x86_64-unknown-linux-gnu folder contains 2490 files
• pypi_lit contains 71 files

Total 161,343 additional files !!! (for 63 tests)

Is it possible to give particular options/flags to bazel to use old fast approach?