Refactor ICE_VERSION logic in the OMERO homebrew installation script

- Rely upon (brew deps omero $BREW_OPTS) to detect installed Ice version
- Remove OMERO_ALT variable (replaced by the scc merge logic in the library)
Remove Homebrew/pip cleanup from the installation script

This cleanup step will be handled in the job directly most certainly using
`rm -rf /usr/local/*` to decrease the maintenance burden.
The TESTING_MODE variable only stipulates whether homebrew-alt PRs should be
merged for now.
Various fileset query tests. See #10782
Merge pull request #1215 from sbesson/rebased/develop/homebrew_ice34

Refactor ICE_VERSION logic in the OMERO homebrew installation script (rebased onto develop)
Merge pull request #1216 from sbesson/homebrew_cleanup

Remove Homebrew/pip cleanup from the installation script
Merge remote-tracking branch 'gh-rl/metadataroot' into in-steps
Remove interleaved and bigEndian
Fix folder import w/ invalid files.
merge develop -D org -I include -E exclude: PR 991 (Add support for Ice 3.5 (develop))
merge develop -D org -I include -E exclude: PR 1132 (Repository API)
merge develop -D org -I include -E exclude: PR 1133 (Code and mapping changes for new schema)
merge develop -D org -I include -E exclude: PR 1187 (Update develop submodules)
merge develop -D org -I include -E exclude: PR 1195 (CLI: handle MIF exceptions (#10783))
merge develop -D org -I include -E exclude: PR 1203 (Show Activities panel with new errors)
merge develop -D org -I include -E exclude: PR 1208 (Remove /tmp/memo from OMEROWrapper (Fix #10836))
merge develop -D org -I include -E exclude: PR 1209 (Merged fs fixes)
merge develop -D org -I include -E exclude: PR 1210 (Chgrp target 10908)
merge develop -D org -I include -E exclude: PR 1211 (Import post demo fix)
merge develop -D org -I include -E exclude: PR 1214 (fix #10782: add IContainer.getImagesBySplitFilesets)
merge develop -D org -I include -E exclude: PR 1217 (Various fileset query tests. See #10782)