Add support for JSDoc @ignore to allow for hiding properties from completions

[Andarist]

closes #47613

[typescript-bot]

The TypeScript team hasn't accepted the linked issue #47613. If you can get it accepted, this PR will have a better chance of being reviewed.

[typescript-bot]

Looks like you're introducing a change to the public API surface area. If this includes breaking changes, please document them on our wiki's API Breaking Changes page.

Also, please make sure @DanielRosenwasser and @RyanCavanaugh are aware of the changes, just as a heads up.

[colinhacks]

Big +1, would love this as a library author. I've been using tilde-prefixed property names as a way to deprioritize internal fields in Intellisense but it's quite hacky.

[typescript-bot]

With 6.0 out as the final release vehicle for this codebase, we're closing all PRs that don't fit the merge criteria for post-6.0 patches. If you think this was a mistake and this PR fits the post-6.0 patch criteria, please post to the 6.0 iteration issue with details (specifically, which PR and which patch criteria it satisfies).

Next steps for PRs:

• For crash bugfixes or language service improvements, PRs are currently accepted at the typescript-go repo
• Changes to type system behavior should wait until after 7.0, at which point mainline TypeScript development will resume in this repository with the Go codebase
• Library file updates (lib.d.ts etc) continue to live in this repo or the DOM Generator repo as appropriate