Make the export wins moved banner only appear on the Export tab

[peterhudec]

Description of change

This PR fixes these shortcomings of #7137

• The banner should only appear on the Export tab
• The link text and aria label should read "see the export wins announcement"

Test instructions

1. Go to /companies/<id>
2. Click through all of the tabs in the main tab nav, e.g. Overview, Activity, Business detail, etc.
3. The banner should only appear when the Export tab is selected
4. The banner's link text and aria label should read "see the export wins announcement".

Screenshots

Before

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After

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Checklist

• Has the branch been rebased to main?
• Automated tests (Any of the following when applicable: Unit, Functional or End-to-End)
• Manual compatibility testing (Browsers: Chrome, Firefox, Edge, Safari)

[cypress]

data-hub-frontend    Run #56050

Run Properties:   Passed #56050  •  6b76165866: Make the export wins moved banner only appear on the Export tab

Project	data-hub-frontend
Branch Review	fix/export-wins-moved-banner
Run status	Passed #56050
Run duration	01m 39s
Commit	6b76165866: Make the export wins moved banner only appear on the Export tab
Committer	Peter Hudec
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	15
View all changes introduced in this branch ↗︎