[GUI] fix identify panel size when long localized strings used (fix #29546)

[alexbruy]

Description

In some locales "Auto open form" text and some items in the "Mode" combobox in the identify panel translated as very long strings. As result panel takes too much screen space and can not be reduced.

Proposed PR replaces QCheckBox with QCheckBox and QLabel with enabled word-wrapping and changes width of the "Mode" combobox. Fixes #29546.

Before

After

Checklist

• Commit messages are descriptive and explain the rationale for changes
• Commits which fix bugs include Fixes #11111 at the bottom of the commit message
• I have read the QGIS Coding Standards and this PR complies with them
• New unit tests have been added for core changes
• I have run the scripts/prepare-commit.sh script before each commit
• I have evaluated whether it is appropriate for this PR to be backported, backport requests are left as label or comment

[nirvn]

+1 to merge.

[qgis-bot]

The backport to release-3_10 failed:

The process 'git' failed with exit code 128

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_10 release-3_10
# Navigate to the new working tree
cd .worktrees/backport-release-3_10
# Create a new branch
git switch --create backport-33643-to-release-3_10
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick 72400524f72e6d83a18a86344cf6c72a886b798f
# Push it to GitHub
git push --set-upstream origin backport-33643-to-release-3_10
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-release-3_10

Then, create a pull request where the base branch is release-3_10 and the compare/head branch is backport-33643-to-release-3_10.