fix: include release notes and assembled date in json output after creating a release

[hnrkndrssn]

Before

❯ octopus release create --space Default --project "Test function" --version 0.0.36 --output-format json --package "henrik-test-function:0.0.1" --release-notes "test release notes" --no-prompt
{"ReleaseNotes":"","Assembled":"0001-01-01T00:00:00Z","Channel":"Default","Version":"0.0.36"}

After

❯ ./octopus release create --space Default --project "Test function" --version 0.0.37 --output-format json --package "henrik-test-function:0.0.1" --release-notes "test release notes" --no-prompt
{"ReleaseNotes":"test release notes","Assembled":"2024-09-18T14:49:56.675+10:00","Channel":"Default","Version":"0.0.37"}

[sc-93329]

[HuyPhanNguyen]

LGTM