Change "bin/bash" to "/bin/bash" when OsType is Linux in pluginService

[kiprasmel]

Change "bin/bash" to "/bin/bash" in pluginService

I suppose this would fix
#668

(additional testing needed)

• I have read the contribution guidelines.
• My change requires a change to the documentation and GitHub Wiki.
• I have updated the documentation and Wiki accordingly.

[shanalikhan]

(additional testing needed)

Can you test the on the following editions.

1. Standard Code on Linux
2. Insiders Code on Linux
3. OSS Code versions on linux.

I will accept the PR, if it works for all of them. ( first two version are working as of now, need to test 3rd one while it dont break the first two)

[kiprasmel]

I will soon, but I think that the pull request #739 is more appropriate - it says to fix the issue of not synchronising & installing extensions on linux oss. I think that testing & applying it out would be better, but I'll look into this as well.

[shanalikhan]

Yes, that pull request is looking like exposing the path for OSS users, and I personally would like some code that would set the path itself by reading some env. variables or any other logic to setup for OSS.

[shanalikhan]

Closing this PR, let me know when its done or ready.