Introduce placeholder resolution support in @ConcurrencyLimit #35461
Description
Commit c9078bf introduced placeholder resolution support for @Retryable attributes – for example, String maxAttemptsString() to complement the existing long maxAttempts() attribute.
Along the same lines, we should introduce placeholder resolution support for the value in @ConcurrencyLimit, so that concurrency throttling configuration can be externalized - for example, in a properties file.