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Add support for requests using application/json content-type on subcloud-backup. This is needed to support the subcloud-backup delete operation, as well as a change on backup create CLI [1] to fix an issue seen in Debian. Test Plan: PASS: - Ensure tox tests are passing - Issue backup request without overrides file using json content - Issue backup request with overrides file using multipart content [1] Review for the Debian fix on the CLI side https://review.opendev.org/c/starlingx/distcloud-client/+/858441 Story: 2010116 Task: 45696 Signed-off-by: Gabriel Silva Trevisan <gabriel.silvatrevisan@windriver.com> Change-Id: Ieafd1a213c9c505aa35b07cf8490abedf2c56a27