tests: Bump DevStack to Dalmatian (2024.2)

[stephenfin]

What this PR does / why we need it:

Bump the version of DevStack used in CI from Bobcat (2023.2) to Dalmatian (2024.2).

Which issue this PR fixes(if applicable):

(none)

Special notes for reviewers:

(none)

Release note:

NONE

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[stephenfin]

/hold

This is the second attempt after the first was reverted (#2730). I need to see how this performs. fwiw though, I saw no performance issues locally.

[kayrus]

@stephenfin see #2730

[stephenfin]

@stephenfin see #2730

Yup, see my comment right above 😄

[EmilienM]

I wonder if #2747 would help.

[kayrus]

/retest

[kayrus]

/test openstack-cloud-csi-manila-e2e-test
previously manila tests took 49m29s
cinder tests took 1h50m18s and failed due to timeout

[kayrus]

/test openstack-cloud-csi-manila-e2e-test

[k8s-ci-robot]

@stephenfin: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
openstack-cloud-csi-manila-e2e-test	b72dc79	link	true	/test openstack-cloud-csi-manila-e2e-test
openstack-cloud-csi-cinder-e2e-test	b72dc79	link	true	/test openstack-cloud-csi-cinder-e2e-test

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[kayrus]

@EmilienM looks like the #2747 doesn't help