* reduce usage of Utils.localizeMessage
As we begin to transition to react-intl's `formatjs` for extraction, our custom wrappers like `Utils.localizeMessage` prevent an adoption roadblock.
This is the first in a series of PRs to begin to migrate away in favour of:
* `useIntl` when inside React functional component
* use `injectIntl` and use access the `intl` prop from class components
* use the new `getIntl`, leveraging a memoized `createIntl` and the store outside of React components
I'm pausing in this effort to get a feel from peers on both the substance of these changes and best practices in supporting them.
* prefer shallowWithIntl, renderWithContext, and local injectIntl wrapping
* revert unintentional whitespaces
* clarify getIntl, add minor unit test
* avoid triggering mmjstool
* update e2e tests
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Co-authored-by: Mattermost Build <build@mattermost.com>
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