NITF: properly take into account comma-separated list of values for JPEG2000 QUALITY

[rouault]

when JPEG2000_DRIVER=JP2OpenJPEG

Fixes #10927

[rouault]

The backport to release/3.9 failed:

The process '/usr/bin/git' failed with exit code 1

stderr

error: could not apply 881550f6e8... NITF: properly take into account comma-separated list of values for JPEG2000 QUALITY
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
hint: Disable this message with "git config advice.mergeConflict false"

stdout

Auto-merging autotest/gdrivers/nitf.py
CONFLICT (content): Merge conflict in autotest/gdrivers/nitf.py
Auto-merging doc/source/drivers/raster/nitf.rst
CONFLICT (content): Merge conflict in doc/source/drivers/raster/nitf.rst
Auto-merging frmts/nitf/nitfdataset.cpp

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-release/3.9 release/3.9
# Navigate to the new working tree
cd .worktrees/backport-release/3.9
# Create a new branch
git switch --create backport-10930-to-release/3.9
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick 881550f6e8726d5461c01b90c4273b736125b96d
# Push it to GitHub
git push --set-upstream origin backport-10930-to-release/3.9
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-release/3.9

Then, create a pull request where the base branch is release/3.9 and the compare/head branch is backport-10930-to-release/3.9.

[rouault]

cherry-picked to 3.9 per e9a6afe