test: update deltachat 2.50 ci compatibility

[ccclxxiii]

summary

this pr updates relay ci/test behavior for compatibility with deltachat rpc/server 2.50.0.

changes

remove unsupported deltachat config

the cmdeploy test account setup previously configured:

account.set_config("delete_server_after", "10")

deltachat rpc/server 2.50.0 now rejects this key with:

unknown key "delete_server_after": matching variant not found

which caused account setup failures before tests could run.

the unsupported setting has been removed/commented out from the relay-side cmdeploy test setup.

update cmlxc workflow pin

the reusable cmlxc workflow reference is pinned to a newer commit containing the matching relay_minitest compatibility fixes, since the previously referenced v0.14.6 workflow still used the obsolete config.

improve sender ip cleanup test handling

test_hide_senders_ip_address has been updated to reduce timing sensitivity and mailbox visibility issues during raw imap inspection by:

• enabling bcc_self
• explicitly selecting INBOX
• polling imap with a timeout
• fetching using criteria="ALL"
• inspecting the newest matching message

this allows the test to inspect a server-visible copy of the submitted message even after deltachat receive processing.

current status

the unsupported deltachat config issue now appears resolved in both cmdeploy and relay_minitest paths.

this pr also updates the sender ip cleanup tests to work with deltachat rpc/server 2.50 mailbox behavior observed during ci runs.

• relevant pr on cmlxc with priority merge

[hpk42]

Please re-do the PR, and use human-written commit messages and PR description. Besides, we need a clear description or reference what exactly fails.

[ccclxxiii]

Please re-do the PR, and use human-written commit messages and PR description. Besides, we need a clear description or reference what exactly fails.

commit message/etc were written by me, i'm not using ai/llm. i'm baffled why you keep making this mention.