[Backport] [Oracle GraalVM] [GR-73449] Backport to 25.0: TRegex: sync OracleDB flavor with upstream update to Unicode version 17.

[bulasevich]

This PR backports:

• [GR-73434] TRegex: sync OracleDB flavor with upstream update to Unicode version 17. oracle/graal#12996
  • oracle/graal@7149106 - extra commit, not mentioned in #36
  • oracle/graal@df204c1 - extra commit, not mentioned in #36
  • oracle/graal@1538d02

Conflicts:

<<<<<<< HEAD
    private static final CaseFoldTable UNICODE_15_0_0_ODB_SIMPLE = new CaseFoldTable(UNICODE_15_1_0_CF_SIMPLE, new int[]{
=======
    private static final CaseFoldTable UNICODE_17_0_0_ODB_SIMPLE = new CaseFoldTable(UNICODE_17_0_0_CF_SIMPLE, new int[]{
>>>>>>> 1538d029bc7 (TRegex: sync OracleDB flavor with upstream update to Unicode version 17)

To resolve the conflict in CaseFoldData.java, I included the prerequisite commits it depends on.

Closes: #36

[zakkak]

Superseded by #57.

Thank you @bulasevich