TEST: change integration fs test format and mount order

[jamesbeyond]

Description

This test case failed when using the fresh new sd card. it failed to mount.
Changed the setup order to format -> mount in the setup stage. So this is aligned with fs-threaded test, and make sure test case working with a new sd card.

Pull request type

[ ] Fix
[ ] Refactor
[ ] Target update
[ ] Functionality change
[ ] Docs update
[x] Test update
[ ] Breaking change

Reviewers

@MarceloSalazar

Release Notes

[ciarmcom]

@jamesbeyond, thank you for your changes.
@MarceloSalazar @ARMmbed/mbed-os-maintainers please review.

[jamesbeyond]

ping @MarceloSalazar , could you review please ?

[0xc0170]

CI started in the background

[MarceloSalazar]

@jamesbeyond thanks for the changes - it makes sense to swap format/mount to align with other tests.
I confirm it works ok on platforms that have storage (L475, K64)

[MarceloSalazar]

I don't think the CI will be able to test this code unless we add -DINTEGRATION_TESTS in our test scripts.
Any plans to remove this requirement and always run the integration tests with greentea?
Maybe we need to send a separate PR to remove the need for this macro.

[mbed-ci]

Test run: SUCCESS

Summary: 4 of 4 test jobs passed
Build number : 1
Build artifacts

[jamesbeyond]

@jamesbeyond thanks for the changes - it makes sense to swap format/mount to align with other tests.
I confirm it works ok on platforms that have storage (L475, K64)

Other test already in the correct order, only just this test.

Hi @0xc0170 , I think this PR ready to go