Fix Threats Found label repeating

[ravishanker]

Moved Threats Header out of loop to stop it from repeating with threat items

Fixes #14790

Scan	Before	After

To test:

Setup

• Need a Jetpack enabled site with Scan plugin installed (Follow the instructions on this P2: p1HpG7-9a5-p2) or Use the one I setup already critical-jambu.jurassic.ninja
• You'll need to launch admin and edit plugin files and add some text and save to report threats as shown in first image above.

Test 1

1. Login with a wp account having a scan capability and two or more threats.
2. Go to the My Site tab -> Tap the Scan item -> Wait till the scan completes on the Scan screen.
3. Once the threat is found, tap on the Fix All button.
4. A Fix all threats confirmation dialog will appear.
5. Tap OK and the threat fixing will start.
6. Notice that the label "Threats found" repeats as many times as there are threats as shown in before image above.

Test 2

• Build and run
• Repeat step 1- 5 from above.
• Notice that the label "Threats found" is shown only once as in after image above.

Regression Notes

1. Potential unintended areas of impact
   None

2. What I did to test those areas of impact (or what existing automated tests I relied on)
   Manual testing

3. What automated tests I added (or what prevented me from doing so)
   Existing threats

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

	Warnings
⚠️	This PR is assigned to a milestone which is closing in less than 4 days Please, make sure to get it merged by then or assign it to a later expiring milestone

Generated by 🚫 dangerJS

[wpmobilebot]

📲 You can test these changes on Jetpack by downloading jetpack-installable-build-pr17234-2d88947.apk

	💡 Scan this QR code with your Android phone to download and install the APK directly on it.
	App	Jetpack
	Build Flavor	Jalapeno
	Build Type	Debug
	Commit	2d88947

Note: This installable build uses the JalapenoDebug build flavor, and does not support Google Login.

[wpmobilebot]

📲 You can test these changes on WordPress by downloading wordpress-installable-build-pr17234-2d88947.apk

	💡 Scan this QR code with your Android phone to download and install the APK directly on it.
	App	WordPress
	Build Flavor	Jalapeno
	Build Type	Debug
	Commit	2d88947

Note: This installable build uses the JalapenoDebug build flavor, and does not support Google Login.

[irfano]

Thanks for explaining how to test the case. The problem is fixed.
LGTM! 👍🏻