IBX-7198: Updated ibexa label margin, form styling in edit and create

[Gengar-i]

Question	Answer
JIRA issue	IBX-7198
Type	bug
Target version	v4.6
BC breaks	no
Doc needed	no
Related	https://github.com/ibexa/activity-log/pull/89
	https://github.com/ibexa/corporate-account/pull/241
	https://github.com/ibexa/order-management/pull/117
	https://github.com/ibexa/page-builder/pull/365
	https://github.com/ibexa/payment/pull/142
	https://github.com/ibexa/personalization/pull/335
	https://github.com/ibexa/product-catalog/pull/1156
	https://github.com/ibexa/segmentation/pull/98
	https://github.com/ibexa/shipping/pull/70
	https://github.com/ibexa/site-factory/pull/95
	https://github.com/ibexa/dashboard/pull/127

Done:

1. Styling header in edit form by design.
2. Removed top margin from label (now container 'ibexa-form-field' have margin-bottom)
3. Removed header margin. (margin: 0 in other packages is about to be removed)

Checklist:

• Provided PR description.
• Tested the solution manually.
• Provided automated test coverage.
• Checked that target branch is set correctly (master for features, the oldest supported for bugs).
• Asked for a review (ping @ibexa/engineering).

[sonarqubecloud]

Quality Gate failed

Failed conditions
19.4% Duplication on New Code (required ≤ 3%)

See analysis details on SonarCloud

[juskora]

QA Approved on Ibexa DXP Commerce 4.6-dev.