Support ESLint's new flat config

[jcfranco]

Check existing issues

• I have checked for existing issues to avoid duplicates

Description

This will help us integrate better with ESLint v9 since flat config is now the default (see https://eslint.org/blog/2024/04/eslint-v9.0.0-released/#flat-config-is-now-the-default-and-has-some-changes).

Acceptance Criteria

Flat configs are supported and used by the calcite-components package.

Relevant Info

#10938 enabled recommended rules to avoid using the current config, which produced the following error:

Oops! Something went wrong! :(

ESLint: 9.17.0

TypeError: Key "rules": Key "@esri/calcite-components/no-dynamic-createelement": Could not find plugin "@esri/calcite-components".
    at throwRuleNotFoundError (/example/path/to/project/node_modules/eslint/lib/config/rule-validator.js:66:11)
    at RuleValidator.validate (/example/path/to/project/node_modules/eslint/lib/config/rule-validator.js:147:17)
    at new Config (/example/path/to/project/node_modules/eslint/lib/config/config.js:228:27)
    at [finalizeConfig] (/example/path/to/project/node_modules/eslint/lib/config/flat-config-array.js:216:16)
    at FlatConfigArray.getConfigWithStatus (/example/path/to/project/node_modules/@eslint/config-array/dist/cjs/index.cjs:1178:55)
    at FlatConfigArray.getConfig (/example/path/to/project/node_modules/@eslint/config-array/dist/cjs/index.cjs:1196:15)
    at entryFilter (/example/path/to/project/node_modules/eslint/lib/eslint/eslint-helpers.js:282:40)
    at async NodeHfs.<anonymous> (file:///example/path/to/project/node_modules/@humanfs/core/src/hfs.js:574:24)
    at async NodeHfs.<anonymous> (file:///example/path/to/project/node_modules/@humanfs/core/src/hfs.js:604:6)
    at async NodeHfs.<anonymous> (file:///example/path/to/project/node_modules/@humanfs/core/src/hfs.js:604:6)

cc @benelan

Which Component

N/A

Example Use Case

No response

Priority impact

impact - p3 - not time sensitive

Calcite package

• @esri/calcite-components
• @esri/calcite-components-react
• @esri/calcite-design-tokens
• @esri/eslint-plugin-calcite-components

Esri team

Calcite (dev)