Attempt to fix 'JSON5: invalid end of input' build error in CI

[matyasf]

The debug statements help to investigate flaky CI builds that fail.
Also remove fse, since the error seems to be that styleDictionarySource is not created in some cases

Trying to fix errors like

scss
✔︎ /home/runner/work/instructure-ui/instructure-ui/packages/canvas-high-contrast-theme/tokens/scss/_variables.scss

scss
✔︎ /home/runner/work/instructure-ui/instructure-ui/packages/canvas-theme/tokens/scss/_variables.scss

scss
✔︎ /home/runner/work/instructure-ui/instructure-ui/packages/ui-theme-tokens/tokens/canvas/scss/_variables.scss

scss
✔︎ /home/runner/work/instructure-ui/instructure-ui/packages/ui-themes/tokens/canvas/scss/_variables.scss
/home/runner/work/instructure-ui/instructure-ui/node_modules/json5/lib/parse.js:1110
    const err = new SyntaxError(message)
                ^

SyntaxError: Failed to load or parse JSON or JS Object: JSON5: invalid end of input at 1:1
    at syntaxError (/home/runner/work/instructure-ui/instructure-ui/node_modules/json5/lib/parse.js:1110:17)
    at invalidEOF (/home/runner/work/instructure-ui/instructure-ui/node_modules/json5/lib/parse.js:1059:12)
    at Object.start (/home/runner/work/instructure-ui/instructure-ui/node_modules/json5/lib/parse.js:843:19)
    at Object.parse (/home/runner/work/instructure-ui/instructure-ui/node_modules/json5/lib/parse.js:32:32)
    at combineJSON (file:///home/runner/work/instructure-ui/instructure-ui/node_modules/style-dictionary/lib/utils/combineJSON.js:111:32)
    at StyleDictionary.extend (file:///home/runner/work/instructure-ui/instructure-ui/node_modules/style-dictionary/lib/StyleDictionary.js:302:28) {
  lineNumber: 1,
  columnNumber: 1
}

Node.js v22.15.0
node:child_process:957
    throw err;
    ^

Error: Command failed: npm run build:tokens
    at genericNodeError (node:internal/errors:983:15)
    at wrappedFn (node:internal/errors:537:14)
    at checkExecSyncError (node:child_process:882:11)
    at execSync (node:child_process:954:15)
    at ChildProcess.<anonymous> (/home/runner/work/instructure-ui/instructure-ui/scripts/bootstrap.js:67:20)
    at ChildProcess.emit (node:events:518:28)
    at ChildProcess._handle.onexit (node:internal/child_process:293:12) {
  status: 1,
  signal: null,
  output: [ null, null, null ],
  pid: 9206,
  stdout: null,
  stderr: null
}

Node.js v22.15.0

[github-actions]

PR Preview Action v1.6.1
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2025-05-08 16:01 UTC

[matyasf]

The error was likely that this was not created in some rare cases, I dont know why. I've replaced it with just native Node code

[balzss]

I don't even know why a 3rd party lib was used in the first place. Good find!