Port : customizable login page

[sahibamittal]

Description

Currently, the login page does not allow any customization.
Add an API endpoint, open to anyone, which returns custom welcome message given by admins.
Adds 2 ConfigProperties to store the message and if it should be shown.

Addressed Issue

Backport change DependencyTrack/hyades#1358
Frontend PR : DependencyTrack/hyades-frontend#133

Checklist

• I have read and understand the contributing guidelines
• This PR fixes a defect, and I have provided tests to verify that the fix is effective
• This PR implements an enhancement, and I have provided tests to verify that it works as intended
• This PR introduces changes to the database model, and I have updated the migration changelog accordingly
• This PR introduces new or alters existing behavior, and I have updated the documentation accordingly

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.02% (target: -1.00%)	✅ 100.00% (target: 70.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (9969486)	21312	17530	82.25%
Head commit (2f87416)	21335 (+23)	17553 (+23)	82.27% (+0.02%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#913)	25	25	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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