[OPT-39999] Mep-xlg-tags.json issues

[AdobeLinhart]

Adds a check to prevent getXLGListURL() from firing multiple times by utilizing promises. It should only perform the call once.

Behavior

• Do not execute network call for mep-xlg-tags if signed out.
• Execute a single network call for mep-xlg-tags if signed in.

Instructions

• Open test URL
• Open the network panel
• Filter for mep-xlg-tags
• Observe the amount of times called
• Test both as a logged in and logged out user.

Before:

After:

Resolves: OPT-39999

Test URLs:

• Before: https://main--da-bacom--adobecom.aem.live/solutions/cmo
• After: https://main--da-bacom--adobecom.aem.live/solutions/cmo?milolibs=OPT-39999
• Psi: https://OPT-39999--milo--adobecom.aem.page/?martech=off

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Commits

• 21ba8c8 ✅ (latest)
• 8bacb6d ✅
• 6a5a3d9 ✅

[jpratt2]

Approved.
Verified: Only one call is seen in the network tab when logged in. (see attached) The content of the network call appears unharmed.

Verified: there is no network call when logged out