refactor(LoginPage): Remove mounted call for test login method

[qux-bbb]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area build

/area tests

What this PR does / why we need it:
This PR refactors the LoginPage component by removing the mounted lifecycle hook call that was used for testing the login method.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

[poiana]

Welcome @qux-bbb! It looks like this is your first PR to falcosecurity/falcosidekick-ui 🎉

[poiana]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[poiana]

Issues go stale after 90d of inactivity.

Mark the issue as fresh with /remove-lifecycle stale.

Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

Provide feedback via https://github.com/falcosecurity/community.

/lifecycle stale

[poiana]

Stale issues rot after 30d of inactivity.

Mark the issue as fresh with /remove-lifecycle rotten.

Rotten issues close after an additional 30d of inactivity.

If this issue is safe to close now please do so with /close.

Provide feedback via https://github.com/falcosecurity/community.

/lifecycle rotten