Move to new eng package

[bwateratmsft]

Plus a few other things I did:

• Loads of lint fixes
• Put *.map into the .npmignores, so that source maps aren't in the tgz. They were interfering with debugging.
• Fixed some issues in RegistryV2DataProvider.ts including some mostly-transparent bugs
• Added UTs for conditional which is a very confusing method
• Added a prelint script to build vscode-processutils, else linting does not work for the packages that depend on it

[Copilot]

Pull request overview

This PR migrates three packages (vscode-processutils, vscode-inproc-mcp, vscode-docker-registries, and vscode-container-client) to use a new centralized engineering package (@microsoft/vscode-azext-eng) for ESLint configuration and tooling. The migration includes updating to ESLint v9's flat config format, improving type safety, and modernizing code patterns.

Key Changes:

• Migration from legacy .eslintrc.json to modern eslint.config.mjs (ESLint flat config)
• Consolidation of dev dependencies into the new @microsoft/vscode-azext-eng package
• Type safety improvements: any → unknown, || → ??, improved type guards
• Removal of redundant async keywords and Promise wrapping

Reviewed changes

Copilot reviewed 67 out of 68 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
package.json	Replaced individual ESLint/testing dependencies with @microsoft/[email protected]
packages/*/eslint.config.mjs	Added new flat ESLint configurations using shared presets
packages/*/.eslintrc.json	Removed legacy ESLint configurations
packages/*/.eslintignore	Removed legacy ignore files (handled by flat config)
packages/*/.npmignore	Added exclusions for new config files and source maps
Type guard functions	Improved from any to unknown with proper type narrowing
Nullish coalescing	Changed `
Async methods	Removed unnecessary async keywords where methods just return Promises
Test files	Removed unused error parameters and improved type assertions

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