runtime(java): Exclude lambda expressions from _when_ _switch-case_ label clauses...

runtime(java): Exclude lambda expressions from _when_ _switch-case_ label clauses (#14945)

These guard clauses are always boolean expressions, whereas
lambda expressions can only appear in either an assignment,
a casting, or an invocation context.

References:
https://docs.oracle.com/javase/specs/jls/se21/html/jls-14.html#jls-14.11.1
https://docs.oracle.com/javase/specs/jls/se21/html/jls-15.html#jls-15.27

Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>