fix(CarouselIndicators): li key values generate from provided item va…

[walker-tx]

…lues

Generation of key items for li components in CarouselIndicators is a
concatenation of specific, optional values (src, caption, and
altText) in each item of the items object array. Lacking these
key/value pairs will cause each li element to have a key along the
lines of undefinedundefinedundefined, resulting two or more of the
li's to be identical and causing an error to log in the console.
While either including any one of the specified keys with a unique
value, or adding a unique key field in each of the items objects will
remedy this issue, that solution is not well documented. The proposed
solution is a transparent fix: preventing the aforementioned error while
requiring no change of code for the end-user. The new key prop value
for each li will be a concatenation of all the values of its
respective item object.

Closes #1310

• Bug fix
• New feature
• Chore
• Breaking change
• There is an open issue which this change addresses
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• My change requires a change to the documentation.
• • I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.