CLDR-18401 SBRSv48: Update CLDR/spec versions, README status, (re-)add XCG ZWG to currency80

[pedberg-icu]

CLDR-18401

• This PR completes the ticket.

• Update README date, version, status.
• Update cldrVersion in dtd and xsd files.
• Update CLDR version in pom files
• Update GEN_VERSION in CLDRFile
• Update DEV_VERSION in ToolConstants.java. Do not yet add entry for 47 in CLDR_VERSIONS(ToolConstants.java) and in CldrVersion.java; wait until 47 final tag/release, and do as a separate step.
• Update spec version. The status (draft, proposed update) should already be correct on the main branch. Also remove the mods for 47 and earlier, add a section for 48.
• Add XCG ZWG to currency80 in coverageLevels.xml. XCG becomes legal tender March 31; ZWG recently became legal tender but was temporarily removed from currency80 for 47 to not impact coverage levels. Delete outdated test skips for currencies.

ALLOW_MANY_COMMITS=true

[srl295]

looks good, maybe needs spotless

[jira-pull-request-webhook]

Hooray! The files in the branch are the same across the force-push. 😃

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[jira-pull-request-webhook]

Hooray! The files in the branch are the same across the force-push. 😃

~ Your Friendly Jira-GitHub PR Checker Bot