Lack tests for "goto EXPR exempt from "looks-like-a-function" rule

[jkeenan]

As part of my research on Fatalization of currently deprecated goto
construct I have been
re-reading our current documentation of goto in blead and have been trying
to locate in our test suite examples of each claim made in that documentation.
What we find -- or fail to find -- there will have an impact on the
documentation updates provided as part of a pull request like the current
#23782. I've posted the preliminary results
of that documentation review
here.

This is the fourth in a series of GH issues addressing the items which I
believe are lacking in that documentation.

perldoc -f goto states:

As shown in this example ['goto ("FOO", "BAR", "GLARCH")[$i];'], "goto EXPR"
is exempt from the "looks like a function" rule. A pair of parentheses
following it does not (necessarily) delimit its argument. "goto("NE")."XT"" is
equivalent to "goto NEXT".

As far as I can tell, we have anything like goto("NE")."XT" in the test
suite. Probably not; ack 'goto\s*\([^)]*\)\s*\.\s*' . turned up nothing in
the entire repository. Write tests for this claim.