feat(accordion-item): update token naming schema

[alisonailea]

Related Issue: #10894

Summary

This PR adds two new tokens which align with the Calcite naming schema.

--calcite-accordion-item-icon-color-start
--calcite-accordion-item-icon-color-end

BEGIN_COMMIT_OVERRIDE
feat(accordion-item): update token naming schema
deprecate(accordion-item): deprecate --calcite-accordion-item-start-icon-color and --calcite-accordion-item-end-icon-color tokens
END_COMMIT_OVERRIDE

[jcfranco]

Code changes LGTM! Let’s use feat since this introduces new props. For the deprecations, please refer to the second part of the deprecation PR section in the PR review guidelines to add a separate changelog entry.

Could you also update the conventional commit description in the PR title to use the imperative, present tense? The imperative part was referenced before in our conventions, but it’s not explicitly listed now. I’ll make sure to update that today.

[jcfranco]

For the deprecations, please refer to the second part of the deprecation PR section in the PR review guidelines to add a separate changelog entry.

@alisonailea Sorry, I should've been more specific. You'll need to use a commit override in the PR description to include both feat and deprecate entries. Something like the following:

BEGIN_COMMIT_OVERRIDE
feat(accordion-item): update token naming schema
deprecate(accordion-item): deprecate start/end icon color CSS props
END_COMMIT_OVERRIDE

@DitwanP Can you confirm?