Revert 09c36781 & tweak linting (#1501)

This diff reverts 09c36781 and tweaks how some of our linting was
working.

I'm not actually sure what caused the regression that 09c36781 was
fixing - it was something to do with typescript being used to transpile
eslintrc.js, but that being excluded from the tsconfig for those
projects. I fixed that by removing `rootDir` from those, but that
revealed some other issues with files not getting ignored correctly.

I fixed the ignoring issue with a change I've wanted to make to these
scripts for a while: only running them on files that are actually
tracked by git, instead of on everything with a relevant extension. A
side effect of that is that we have to re-implement .eslintignore
support ourselves, but that's very straight forward: the `ignore`
package that eslint uses is very easy to include.

### Change Type
- [x] `internal` — Any other changes that don't affect the published
package (will not publish a new version)

### Test Plan
-

### Release Notes
[internal-only]

apps/vscode/editor/package.json

@@ -30,7 +30,7 @@
 		"build": "yarn run -T tsx scripts/build.ts",
 		"dev": "yarn run -T tsx scripts/dev.ts",
 		"clean": "rm -rf .turbo && rm -rf node_modules && rm -rf dist",
-		"lint": "yarn run -T eslint --report-unused-disable-directives --ignore-path ../../../.eslintignore"
+		"lint": "yarn run -T tsx ../../../scripts/lint.ts"
 	},
 	"devDependencies": {
 		"@tldraw/assets": "workspace:*",

apps/vscode/editor/tsconfig.json

@@ -21,8 +21,7 @@
 		"composite": true,
 		"importHelpers": false,
 		"skipDefaultLibCheck": true,
-		"experimentalDecorators": true,
-		"rootDir": ".."
+		"experimentalDecorators": true
 	},
 	"include": ["src", "../messages", "scripts", "../vscode-script-utils"],
 	"references": [

apps/vscode/extension/package.json

@@ -126,7 +126,7 @@
 		"build": "cd ../editor && yarn build && cd ../extension && tsx scripts/build.ts",
 		"package": "yarn build && tsx scripts/package.ts",
 		"publish": "vsce publish",
-		"lint": "yarn run -T eslint --report-unused-disable-directives --ignore-path ../../../.eslintignore",
+		"lint": "yarn run -T tsx ../../../scripts/lint.ts",
 		"clean": "rm -rf .turbo && rm -rf node_modules && rm -rf dist && rm -rf editor && rm -rf temp & yarn"
 	},
 	"devDependencies": {

apps/vscode/extension/tsconfig.json

@@ -21,8 +21,7 @@
 		"composite": true,
 		"importHelpers": false,
 		"skipDefaultLibCheck": true,
-		"experimentalDecorators": true,
-		"rootDir": ".."
+		"experimentalDecorators": true
 	},
 	"include": ["src", "../messages", "scripts", "../vscode-script-utils"],
 	"references": [{ "path": "../../../packages/file-format" }]