web: update to ESLint 9 (#10812)

* web: update to ESLint 9

ESLint 9 has been out for awhile now, and all of the plug-ins that we use have caught up, so it is
time to bite the bullet and upgrade.  This commit:

- upgrades to ESLint 9, and upgrades all associated plugins
- Replaces the `.eslintrc` and `.eslintignore` files with the new, "flat" configuration file,
  "eslint.config.mjs".
- Places the previous "precommit" and "nightmare" rules in `./scripts/eslint.precommit.mjs` and
  `./scripts/eslint.nightmare.mjs`, respectively
- Replaces the scripted wrappers for eslint (`eslint`, `eslint-precommit`) with a single executable
  that takes the arguments `--precommit`, which applies a stricter set of rules, and `--nightmare`,
  which applies an even more terrifyingly strict set of rules.
- Provides the scripted wrapper `./scripts/eslint.mjs` so that eslint can be run from `bun`, if one
  so chooses.
- Fixes *all* of the lint `eslint.config.mjs` now finds, including removing all of the `eslint`
  styling rules and overrides because Eslint now proudly leaves that entirely up to Prettier.

To shut Dependabot up about ESLint.

* Added explanation for no-console removal.

* web: did not need the old and unmaintained nightmare mode; it can be configured directly.

web/src/components/ak-multi-select.ts

@@ -26,11 +26,6 @@ const selectStyles = css`
  */
 @customElement("ak-multi-select")
 export class AkMultiSelect extends AkControlElement {
-    constructor() {
-        super();
-        this.dataset.akControl = "true";
-    }
-
     static get styles() {
         return [PFBase, PFForm, PFFormControl, selectStyles];
     }
@@ -94,6 +89,11 @@ export class AkMultiSelect extends AkControlElement {
         return this.values;
     }
 
+    connectedCallback() {
+        super.connectedCallback();
+        this.dataset.akControl = "true";
+    }
+
     renderHelp() {
         return [
             this.help ? html`<p class="pf-c-form__helper-text">${this.help}</p>` : nothing,

web/src/components/ak-status-label.ts

@@ -8,8 +8,11 @@ import { classMap } from "lit/directives/class-map.js";
 import PFLabel from "@patternfly/patternfly/components/Label/label.css";
 import PFBase from "@patternfly/patternfly/patternfly-base.css";
 
-const statusNames = ["error", "warning", "info"] as const;
-type StatusName = (typeof statusNames)[number];
+// The 'const ... as const' construction will throw a compilation error if the const variable is
+// only ever used to generate the type information, so the `_` (ignore unused variable) prefix must
+// be used here.
+const _statusNames = ["error", "warning", "info"] as const;
+type StatusName = (typeof _statusNames)[number];
 
 const statusToDetails = new Map<StatusName, [string, string]>([
     ["error", ["pf-m-red", "fa-times"]],