HBASE-27630: hbase-spark bulkload stage directory limited to hdfs only

[ss77892]

The reason for the problem was the usage of the default FileSystem instances for creating and using staging stuff. Now we use the staging path to obtain the FileSystem instance, so it should work correctly for any different from the hdfs schema.
The test uses a local filesystem and doesn't load files to the table due to limitations:

1. HBase minicluster uses hdfs only, and there is no way to specify a custom hbase.rootdir for that. So the load would not work because the staging dir is on a different filesystem
2. I tried to get hadoop-aws mock implementation working for an external filesystem, but that would require making the tests for this module published first

Both those two bullets can be addressed in separate jiras if required.

[Apache-HBase]

🎊 +1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	0m 42s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s	The patch appears to include 1 new or modified test files.
		_ master Compile Tests _
+1 💚	mvninstall	1m 36s	master passed
+1 💚	compile	0m 38s	master passed
+1 💚	scaladoc	0m 48s	master passed
		_ Patch Compile Tests _
+1 💚	mvninstall	0m 48s	the patch passed
+1 💚	compile	0m 39s	the patch passed
+1 💚	scalac	0m 39s	the patch passed
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	scaladoc	0m 47s	the patch passed
		_ Other Tests _
+1 💚	unit	7m 35s	hbase-spark in the patch passed.
		14m 16s

Subsystem	Report/Notes
Docker	ClientAPI=1.42 ServerAPI=1.42 base: https://ci-hbase.apache.org/job/HBase-Connectors-PreCommit/job/PR-108/1/artifact/yetus-precommit-check/output/Dockerfile
GITHUB PR	#108
Optional Tests	dupname scalac scaladoc unit compile
uname	Linux 1c4312f80fa8 5.4.0-135-generic #152-Ubuntu SMP Wed Nov 23 20:19:22 UTC 2022 x86_64 GNU/Linux
Build tool	hb_maven
Personality	dev-support/jenkins/hbase-personality.sh
git revision	master / c221896
Test Results	https://ci-hbase.apache.org/job/HBase-Connectors-PreCommit/job/PR-108/1/testReport/
Max. process+thread count	945 (vs. ulimit of 12500)
modules	C: spark/hbase-spark U: spark/hbase-spark
Console output	https://ci-hbase.apache.org/job/HBase-Connectors-PreCommit/job/PR-108/1/console
versions	git=2.20.1
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[stoty]

LGTM

[stoty]

+1 LGTM, but I am not a committer.