Update enterprise-imports ESLint rule

[valerybugakov]

Problem statement

The enterprise-imports ESLint rule would give false positives with absolute imports in files under the enterprise foder.

// src/enterprise/main.ts
import { test } from '@sourcegraph/web/enterprise/test.ts' // should not trigger ESLint error

Success criteria

1. The enterprise-imports ESLint rule is updated to work with absolute imports in files under the enterprise foder.
2. dev/check/ts-enterprise-import.sh in dev/check/all.sh is removed.

Things to learn/practice during the implementation

ESLint configuration in monorepos.

Implementation details

Relevant PR that introduced the ESLint rule: #23044

Estimated amount of work

T-shirt size estimate: M.

[github-actions]

Heads up @umpox @valerybugakov @5h1rU @pdubroy @taylorsperry - the "team/frontend-platform" label was applied to this issue.

[chrishalbert]

This looks resolved at this point I think.

[valerybugakov]

Yep 👍