Show tech errors in cisco-8000 platform

[balajib-cisco]

While running showtech support in Cisco-8000 platform following errors are seen. This failure is happening because non-file entries like current directory "." and subdirectory "./Cisco-8102-C64" are being saved as a file. The code is modified to skip non-file entries being saved in dump directory

mkdir: created directory '/var/dump/sonic_dump_mth64-m5-2_20221026_201933/sai'
cp: -r not specified; omitting directory '.'
handle_error $? $LINENO
ERR: RC:-1 observed on line 762
sonic_dump_mth64-m5-2_20221026_201933/sai/./
rm: cannot remove '/var/dump/sonic_dump_mth64-m5-2_20221026_201933/sai/.': Is a directory
handle_error $? $LINENO
ERR: RC:-1 observed on line 769
cp: -r not specified; omitting directory './Cisco-8102-C64'
handle_error $? $LINENO
ERR: RC:-1 observed on line 762
tar: sonic_dump_mth64-m5-2_20221026_201933/sai/Cisco-8102-C64: Cannot stat: No such file or directory
tar: Exiting with failure status due to previous errors
tar append operation failed. Aborting to prevent data loss