Log updater.secret creation and expiration

[joshtrichards]

We should be logging whenever the updater.secret gets set and whenever it expires out. This may help catch some situations such as:

• clicking on the "Open updater" button in different tabs/windows/browsers (which will break an existing Updater run in the original tab/window/browser)
• ? not sure but that's why we should log this sort of thing to make debugging easier :)

The updater.secret is re-generated every time the "Open updater" button is clicked in the Administration settings->Overview screen.

server/apps/updatenotification/src/components/UpdateNotification.vue

Line 57 in 3237123

@click="clickUpdaterButton">{{ t('updatenotification', 'Open updater') }}</a>

server/apps/updatenotification/src/components/UpdateNotification.vue

Line 426 in 3237123

axios.get(generateUrl('/apps/updatenotification/credentials'))

server/apps/updatenotification/lib/Controller/AdminController.php

Line 56 in 08baf17

public function createCredentials(): DataResponse {

The token is also automatically deleted 48 hours later:

server/apps/updatenotification/lib/BackgroundJob/ResetToken.php

Lines 44 to 46 in 08baf17

	// Delete old tokens after 2 days
	if ($secretCreated >= 172800) {
	$this->config->deleteSystemValue('updater.secret');

We should log:

• when the updater.secret is generated
• when an outdated updater.secret is removed

The log level should be WARN so that it's picked up by default in most environments. This should be acceptable because the secret is generated rarely and the expiration background job can only have a secret to clear (and thus log about) as often as a new secret is generated.