feat: [confidentialcomputing] Add a new field `token_type` to `TokenOptions` message proto #6669

Job	Run time
gapic-bom	36s
gitignore_correctness	35s
owlbot-py	32s
owlbot-yaml	21s
root-pom	37s
consolidate-config	1m 29s
generate-readme	34s
group_id_check_for_maps_libraries	3m 58s
package_name_check	27s
	9m 9s

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