PageHeader: Remove tooltip from default details field

[interactivellama]

Fixes https://github.com/salesforce/design-system-react/pull/3091#issuecomment-1441214335

Additional description

This removes the dual title and tooltip now that truncate is present. If you want a Tooltip, please add one.

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CONTRIBUTOR checklist (do not remove)

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REVIEWER checklist (do not remove)

• [ ] CircleCI tests pass. This includes linting, Mocha, Jest, Storyshots, and components/component-docs.json tests.
• [ ] Tests have been added for new props to prevent regressions in the future. See readme.
• [ ] Review the appropriate Storybook stories. Open http://localhost:9001/.
• [ ] The Accessibility panel of each Storybook story has 0 violations (aXe). Open http://localhost:9001/.
• [ ] Review tests are passing in the browser. Open http://localhost:8001/.
• [ ] Review markup conforms to SLDS by looking at DOM snapshot strings.

  Required only if there are markup / UX changes

• [ ] Add year-first date and commit SHA to last-slds-markup-review in package.json and push.
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[interactivellama]

@chuyler Could you review this for me?

[chuyler]

The second (gray) tooltip comes from title={label}. I'm not sure which tooltip is the desired one but it appears that this version will work fine. The other option is to keep all this code you are removing and just eliminate title={label}.