Restore scala.recompile.mode default to 'all' and introduce fast-build profile

[baibaichen]

Problem

PR #11560 changed the default scala.recompile.mode from all to incremental.
This causes build failures in clean/CI environments because Zinc's incremental
compiler does not reliably track transitive dependencies across Spark's module
structure, producing errors like:

Symbol 'type org.apache.spark.sql.internal.SqlApiConf' is missing from the classpath.

Solution

1. Restore scala.recompile.mode default to all (safe for CI).
2. Rename the bloop profile (added in [CORE] Add Bloop integration for faster Scala incremental compilation #11645) to fast-build and add
   scala.recompile.mode=incremental inside it, so bloop setup and
   run-scala-test.sh (which use -Pfast-build) benefit from faster incremental
   compilation in contexts where Zinc's analysis is warm.
3. Simplify run-scala-test.sh: replace 5 redundant -D skip flags with -Pfast-build.
4. Also includes pathing JAR support in run-scala-test.sh to avoid command-line length limits.