Prior to this commit, the toString() implementation in ProfilesParser
(which is the internal implementation of Profiles.of()) concatenated
profile expressions with " or ".
For example, the string representation of
Profiles.of("spring & framework", "java | kotlin") was
"spring & framework or java | kotlin".
This commit improves the toString() implementation by wrapping
individual profile expressions in parentheses and concatenating them
with " | ".
For example, the string representation from the previous example is now
"(spring & framework) | (java | kotlin)".
This makes it easier to read (for example, when debugging) and
comprehend.
As an additional benefit, the result of invoking toString() can even be
used as a logically equivalent composite profile expression, though
that is not the primary goal of this change.
Closes gh-30374
845488af8d