Adding support for clients to add their own stage domain maps

[bandana147]

• Making stageDomainsMap configurable through consuming client

Resolves: MWPW-161164

Test URLs:

• Before: https://main--milo--adobecom.hlx.page/?martech=off
• After: https://stage-domain-config--milo--adobecom.hlx.page/?martech=off

QA:

• https://adobecom.github.io/nav-consumer/navigation.html?navbranch=stage-domain-config

[aem-code-sync]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed.
In case there are problems, just click a checkbox below to rerun the respective action.

• Re-run PSI checks
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Commits

• 2c2c082 ✅ (latest)
• b0f5b85 ✅
• de32e44 ✅

[aem-code-sync]

	Page	Scores	Audits	Google
📱	/?martech=off
🖥️	/?martech=off

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.33%. Comparing base (d809cd5) to head (2c2c082).
Report is 9 commits behind head on stage.

Additional details and impacted files

@@            Coverage Diff             @@
##            stage    #3134      +/-   ##
==========================================
- Coverage   96.35%   96.33%   -0.02%     
==========================================
  Files         245      245              
  Lines       56316    56321       +5     
==========================================
- Hits        54261    54258       -3     
- Misses       2055     2063       +8     

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[spadmasa]

Validation done on the PR on below url
https://adobecom.github.io/nav-consumer/navigation.html?env=stage&navbranch=stage-domain-config&authoringpath=/federal/dev/souji/home&customlinks=home,apps,files,firefly,benefits,learn,discover&showUnavSectionDivider=true