Update to ESLint 9.11 and typescript-eslint 8.11

[wgoehrig]

Since ESLint v8.x reaches end of life this weekend, it's time for us to start work on updating to v9.

This is currently blocked waiting on two dependencies to update:

• eslint-plugin-import - PR is merged, release expected in the next few days.
• eslint-plugin-react-hooks - Also merged, but only "officially" releasing with React 19, which has been delayed for months. We may have to use the beta, or opt for the ESLint compatibility utilities.

So far I've only tested these changes in itwinjs-core.

We will also need to decide what to do about stylistic rules - these have moved out of typescript-eslint to @stylistic/eslint-plugin-ts, but the stylistic rules overall are discouraged by typescript-eslint. We may want to consider prettier or dprint...

[aruniverse]

lgtm, but missing beachball changes
i assume this should be a new major ver of this pkg, and wed want to start off with pre-releases?

[wgoehrig]

lgtm, but missing beachball changes i assume this should be a new major ver of this pkg, and wed want to start off with pre-releases?

Just added the beachball changes, but might need some help w/ publishing pre-releases if you all think those are necessary...

[ben-polinsky]

lgtm, but missing beachball changes i assume this should be a new major ver of this pkg, and wed want to start off with pre-releases?

Just added the beachball changes, but might need some help w/ publishing pre-releases if you all think those are necessary...

Just a GH action to trigger, I can do it after merge.