fix(updater): make pubkey optional in tauri config, check if set at runtime (fixes #2438)

[wovw]

If pubkey isn't set in tauri config, there's a new error to make sure it's set at least at runtime.
Currently the pubkey set at runtime overwrites the one in config if it's set, shown with a warning.
Let me know if I need to make any edits anywhere.

[FabianLars]

i don't think there's much value in that log here, at least not on warn level. Maybe debug level but i really wouldn't mind removing it.

Instead we should think about having a warning at compile time though that likely has to happen in tauri's cli.
Speaking of which, we'd also need to change the cli https://github.com/tauri-apps/tauri/blob/afdd288eab7d8473fd6ad2796571a24c4873a8db/crates/tauri-cli/src/interface/rust.rs#L783

[wovw]

I nested the warning log further, it could serve as an incentive for the developer to keep it only in one or the other, but we could also just make it a debug log.

[wovw]

I took at look at making changes in tauri-cli. From my understanding, it looks like in https://github.com/tauri-apps/tauri/blob/afdd288eab7d8473fd6ad2796571a24c4873a8db/crates/tauri-cli/src/bundle.rs#L223 the pubkey is validated against the private key when bundling. We could make this check optional if the pubkey doesn't exist in the config + show a warning. Should I go ahead with this?

[github-actions]

Package Changes Through 728a6be

There are 14 changes which include sql with minor, sql-js with minor, deep-link with patch, deep-link-js with patch, fs with minor, fs-js with minor, http with patch, http-js with patch, updater with patch, updater-js with patch, nfc with patch, nfc-js with patch, dialog with minor, dialog-js with minor

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
api-example	2.0.41	2.0.42
api-example-js	2.0.37	2.0.38
deep-link-example-js	2.2.10	2.2.11
deep-link	2.4.7	2.4.8
deep-link-js	2.4.7	2.4.8
fs	2.4.5	2.5.0
fs-js	2.4.5	2.5.0
dialog	2.6.0	2.7.0
dialog-js	2.6.0	2.7.0
http	2.5.7	2.5.8
http-js	2.5.7	2.5.8
nfc	2.3.4	2.3.5
nfc-js	2.3.4	2.3.5
persisted-scope	2.3.5	2.3.6
single-instance	2.4.0	2.4.1
sql	2.3.2	2.4.0
sql-js	2.3.2	2.4.0
updater	2.10.0	2.10.1
updater-js	2.10.0	2.10.1

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