3.0 release: deprecations to remove

[bennypowers]

• patternfly-elements/tools/pfe-tools/test/utils.ts

  Line 15 in fe6e646

  /** @deprecated - use `getElementCenterPosition` */

• patternfly-elements/tools/pfe-tools/test/react-wrapper.ts

  Line 50 in fe6e646

  * @deprecated use react wrapper components

• patternfly-elements/core/pfe-core/functions/deprecatedCustomEvent.ts

  Line 5 in fe6e646

  export function deprecatedCustomEvent<T>(name: string, detail?: T): CustomEvent<T> {

• patternfly-elements/scripts/icons.ts

  Line 4 in fe6e646

  * 1. We wanted to ship icon files separately from `@patternfly/elements`

  (tribe shipped icons, rely on the icons package instead)

• patternfly-elements/tools/pfe-tools/11ty/DocsPage.ts

  Line 119 in fe6e646

  // TODO: switch to false in next major

  (get rid of renderers altogether)

[bennypowers]

Closed by #2655 and by 16d0dd7 and 1b78b7c