Enhance expect alerts command

[asirvadAbrahamVarghese]

From now on, as we are planning to use flashClassMap to mention flash type in expect_flash command, passing flashClassMap.error (which equals 'danger') would fail because the command looked for a key named 'danger'(for danger the key name is 'error') in the map

and defaulted to 'success' when not found.
Similarly any other invalid values passed will also default to 'success' due to this condition ⬇️

Before:

Fails after looking for alert-success when an invalid flash-type is passed to the command

After:

Fails with a proper error message:

@miq-bot assign @GilbertCherrie
@miq-bot add-label cypress
@miq-bot add-label test

[jrafanie]

LGTM

[jrafanie]

@Fryguy thoughts on spassky/yes
#9539 updates cypress/jest for form-data
#9554 adds flashClassMap
#9557 depends on flashClassMap

[jrafanie]

he said, yup, add the labels 😉

[Fryguy]

Backported to spassky in commit 1f1e603.

commit 1f1e603d515b973b067c606f461a89ff634ce82f
Author: Joe Rafaniello <[email protected]>
Date:   Mon Aug 18 16:25:31 2025 -0400

    Merge pull request #9557 from asirvadAbrahamVarghese/enhance-expect-alerts-command
    
    Enhance expect alerts command
    
    (cherry picked from commit 30db3745b5acec371b3ff0cf490e8a0d5dd0b086)