fix : HBASE-28585. Add namespace handling method in copy_tables_desc.rb

[SWH12]

When utilizing the copy_tables_desc.rb script to duplicate tables to a target cluster, if the specified table's namespace is nonexistent in the target cluster, the script fails to execute successfully. It is recommended to incorporate logic within the script for detecting and handling scenarios where the namespace does not exist.

and fix spelling errors.

[Apache-HBase]

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GITHUB PR	#5884
Optional Tests
uname	Linux c0c7189b89ea 5.4.0-1103-aws #111~18.04.1-Ubuntu SMP Tue May 23 20:04:10 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
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GITHUB PR	#5884
Optional Tests
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git revision	master / 23fa363
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+1 💚	@author	0m 0s	The patch does not contain any @author tags.
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+1 💚	spotless	0m 45s	branch has no errors when running spotless:check.
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-0 ⚠️	rubocop	0m 4s	The patch generated 4 new + 3 unchanged - 1 fixed = 7 total (was 4)
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
+1 💚	spotless	0m 39s	patch has no errors when running spotless:check.
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GITHUB PR	#5884
Optional Tests	dupname asflicense spotless rubocop
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Build tool	maven
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git revision	master / 23fa363
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