Port template-no-accesskey-attribute rule from PR #2371

[Copilot]

Splits out ember/template-no-accesskey-attribute from umbrella PR #2371. Disallows accesskey attributes on HTML elements in templates due to screen reader and keyboard navigation conflicts.

Implementation

• Rule: Checks GlimmerElementNode for GlimmerAttrNode with name === 'accesskey'
• Auto-fix: Removes attribute including preceding whitespace
• Category: Best Practices (accessibility)

Example

// ❌ Invalid
<template>
  <button accesskey="s">Save</button>
</template>

// ✅ Valid  
<template>
  <button>Save</button>
</template>

Files

• lib/rules/template-no-accesskey-attribute.js - Rule implementation (54 lines)
• tests/lib/rules/template-no-accesskey-attribute.js - Test coverage (4 valid, 4 invalid cases)
• docs/rules/template-no-accesskey-attribute.md - Documentation

Part of splitting PR #2371 into individual rules. No config changes per agreed constraints.

Original prompt

Repository: ember-cli/eslint-plugin-ember
Base branch: master

We are splitting umbrella PR #2371 into one PR per lint rule.

Already extracted/merged earlier:

• Port template-no-log rule from PR #2371 #2381 (template-no-log)

In progress / most recently created:

• PR for template-link-href-attributes (created via prior task)

Now create the NEXT PR in the agreed order, with exactly ONE rule:

• ember/template-no-accesskey-attribute

Constraints:

• Do NOT bring forward strict-gjs / strict-gts configs (no config files, no README mentions, no badges).
• PR must contain only this rule’s implementation + tests + docs (+ minimal shared utilities strictly required).
• Ensure no unrelated changes.
• Ensure tests/lint pass.

PR metadata:

• Title: "Port template-no-accesskey-attribute rule from PR Port over all ember-template-lint rules #2371"
• Description references Port over all ember-template-lint rules #2371 and notes this is part of splitting it.

Implementation notes:

• Start from master.
• Pull only the diffs relevant to this rule from PR Port over all ember-template-lint rules #2371.
• Register/export the rule so it can be used.
• Add docs at docs/rules/template-no-accesskey-attribute.md.
• Add appropriate tests in the repo’s standard rule test location.

Deliverable:

• Open the PR against master.

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