Bug 54198205: The Tags in nuspec file is wrong on Foundation repo

[alexlamtest]

According to this, the Tags element string is space-delimited, so ',' alone would not split a tag string.

How built:

• These changes will go through PR validation as usual.

How tested:

• The ultimate test is to visually verify that the Tags are shown correctly in the landing page of the related feed.

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[alexlamtest]

/azp run

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