sap_install_media_detect: Detection of duplicate SAR files for EXE, EXEDB, igs, igshelper and webdisp should count only file with type=sapcar

[rob0d]

This is a fix for issue #703

[berndfinger]

I tested a download directory with S/4HANA Foundation 2022 with:

• SAPEXE_201-70006642.SAR
• SAPEXEDB_201-70006641.SAR
• igsexe_4-70005417.sar
• igshelper_17-10010245.sar
  and some four dummy text files with the same prefix but without the suffix (e.g. SAPEXE_201-70006642).
  When using the dev tree with the proposed change in this PR, the role finished with the expected entries for sap_swpm_igs_file_name, sap_swpm_igs_helper_file_name, sap_swpm_kernel_dependent_file_name, and sap_swpm_kernel_independent_file_name.
  When using the current dev tree, the role fails (as described in sap_install_media_detect: Kernel info files in download basket incorrectly counted as kernel duplicates #703) with:

  assertion: __sap_install_media_detect_fact_files_sapfile_results | selectattr('file', 'search', 'SAPEXE_') | length == 1
  evaluated_to: false
  msg: No, or more than one, DB independent SAP Kernel file found

When using the dev tree but without the four dummy text files, the resulting outputs of task Test result for 'sap_s4hana_foundation_2022': Display _result_dict are identical.

---> PASS

[berndfinger]

LGTM