Remove lint task

[Kesin11]

Description

Lint job has been broken since #103.
These errors seem to be caused by something that has changed with the latest TypeScript.

Run npm run lint

> [email protected] lint
> ts-standard src/**/*

ts-standard: Standard for TypeScript! (https:/standard/ts-standard)
  /home/runner/work/setup-job-workspace-action/setup-job-workspace-action/src/github_env.ts:0:0: Parsing error: DeprecationError: 'originalKeywordKind' has been deprecated since v[5](https:/DeNA/setup-job-workspace-action/actions/runs/6132588829/job/16643613458#step:5:6).0.0 and can no longer be used. Use 'identifierToKeywordKind(identifier)' instead. (null)
  /home/runner/work/setup-job-workspace-action/setup-job-workspace-action/src/main.ts:0:0: Parsing error: DeprecationError: 'originalKeywordKind' has been deprecated since v5.0.0 and can no longer be used. Use 'identifierToKeywordKind(identifier)' instead. (null)
  /home/runner/work/setup-job-workspace-action/setup-job-workspace-action/src/post.ts:0:0: Parsing error: DeprecationError: 'originalKeywordKind' has been deprecated since v5.0.0 and can no longer be used. Use 'identifierToKeywordKind(identifier)' instead. (null)
  /home/runner/work/setup-job-workspace-action/setup-job-workspace-action/src/workspace.ts:0:0: Parsing error: DeprecationError: 'originalKeywordKind' has been deprecated since v5.0.0 and can no longer be used. Use 'identifierToKeywordKind(identifier)' instead. (null)

Unfortunately, standard/ts-standard is not in active development, so I have removed Lint task because this repository is not large to need lint.

Related issue:

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[srz-zumix]

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