chore: remove global solana from PATH filtering, use isolated .local tooling when entering devenv.sh

[sergeytimoshin]

1. devenv.sh update fixes the error when global tooling does not have solana target installed:

  error[E0463]: can't find crate for `std`
          |
          = note: the `sbpf-solana-solana` target may not be installed
          = help: consider adding the standard library to the sysroot with `x build library --target sbpf-solana-solana`
          = help: consider building the standard library from source with `cargo build -Zbuild-std`
        
        For more information about this error, try `rustc --explain E0463`.
        error: could not compile `solana-big-mod-exp` (lib) due to 1 previous error
        warning: build failed, waiting for other jobs to finish...
        error[E0463]: can't find crate for `core`
          |
          = note: the `sbpf-solana-solana` target may not be installed
          = help: consider adding the standard library to the sysroot with `x build library --target sbpf-solana-solana`
          = help: consider building the standard library from source with `cargo build -Zbuild-std`
        
        error: could not compile `itoa` (lib) due to 1 previous error
         ELIFECYCLE  Command failed with exit code 1.
         WARN   Local package.json exists, but node_modules missing, did you mean to install?

2. test.sh update fixes the error which prevents to run test.sh when you're in the devenv:

./scripts/test.sh 
  Failed to source devenv.sh. Aborting.

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch sergey/fix-devenv

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