Move the remaining 60 or so test files into an entry/ subdirectory.
These cover general entry types and features: entry args, fill, text,
env, compress, replace, template, collection, ELF, overlap, listing,
sections, symlink, TEE OS, and other miscellaneous entries. Drop the
numeric prefixes and update all references.

Signed-off-by: Simon Glass <simon.glass@canonical.com>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>

Dynamically going through the subnode array and deleting leads to
templates being skipped from deletion when templates are consecutive in
the subnode list. Prevent this from happening by first parsing the DT
and then deleting the nodes. Add a testcase as well for this cornercase.

Signed-off-by: Neha Malcom Francis <n-francis@ti.com>