Fix autogen gossip name mismatch

[t-eckert]

Changes proposed in this PR:

• Fixes issue Gossip encryption key secret name mismatched when set autoGenerate=true with a custom chart name #1186 where the create federation secret job was failing due to it looking up the autogenerated gossip encryption key by the name consul-gossip-encryption-key and not using the release name.
• Added a test to catch that the release name is used when looking up the gossip key. This does not test the integration, but only that the release name itself is used in the gossip key name.
• Small tidy where I changed "Secet" to "Secret" in the BATS tests.

How I've tested this PR:

From the charts directory, run bats test/unit/create-federation-secret-job.bats.

How I expect reviewers to test this PR:

Using BATS tests as well.

Checklist:

• Tests added
• CHANGELOG entry added

  HashiCorp engineers only, community PRs should not add a changelog entry.
  Entries should use present tense (e.g. Add support for...)