Remove the unnecessary scheduler.rs file

[steedmicro]

Description

After the rewrite of the build infrastructure, the project structure has changed successfully.

But currently we are having one unnecessary code file in the project - ./native-link-scheduler/src/scheduler.rs.

I confirmed all other source files are okay.

The detailed description can be found from the issue link below.

Fixes #430

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please also list any relevant details for your test configuration

Checklist

• Updated documentation if needed
• Tests added/amended
• bazel test //... passes locally
• PR is contained in a single commit, using git amend see some docs

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This change is 

[aaronmondal]

Oh another oversight 😅 Yeah I split this into the worker_scheduler and action_scheduler files. The restructuring initially used a layout like this:

src/
  lib.rs
  scheduler.rs
  scheduler/
    someinternalfile.rs

Where all the things that are now native-link-somethin were just a single crate. That turned out to be too bad for build performance though so the final version split that up into the smaller crates that we have now. This is an artifact from that intermediary step.

❤️

Reviewed 2 of 2 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @steed924)