[PR #7352/0ca07b0b backport][stable-7] Add executable option to cargo (#7357)

Add `executable` option to cargo (#7352)

* Add `executable` option to cargo

Add `executable` option to cargo to make the module easier to use with
cargo installed by rustup.

* Add changelog fragment

* Add license to integration test

* Do not test on CentOS 6

CentOS 6 cannot even validate the certificate in https://sh.rustup.rs.

* Fix condition to skip tests on CentOS 6

* Add version_added to path

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update plugins/modules/cargo.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* shell → command

---------

Co-authored-by: Felix Fontein <felix@fontein.de>
(cherry picked from commit 0ca07b0b05)

Co-authored-by: radek-sprta <mail@radeksprta.eu>

tests/integration/targets/cargo/tasks/main.yml

@@ -18,3 +18,5 @@
   - import_tasks: test_version.yml
   environment: "{{ cargo_environment }}"
   when: has_cargo | default(false)
+- import_tasks: test_rustup_cargo.yml
+  when: rustup_cargo_bin | default(false)