- The current architecture is inherently insecure, because you can
construct the 'secret' cookie value with values that are available in
the database. Thus provides zero protection when a database is
dumped/leaked.
- This patch implements a new architecture that's inspired from: [Paragonie Initiative](https://paragonie.com/blog/2015/04/secure-authentication-php-with-long-term-persistence#secure-remember-me-cookies).
- Integration testing is added to ensure the new mechanism works.
- Removes a setting, because it's not used anymore.
(cherry picked from commit eff097448b1ebd2a280fcdd55d10b1f6081e9ccd)
[GITEA] rework long-term authentication (squash) add migration
Reminder: the migration is run via integration tests as explained
in the commit "[DB] run all Forgejo migrations in integration tests"
(cherry picked from commit 4accf7443c1c59b4d2e7787d6a6c602d725da403)
(cherry picked from commit 99d06e344ebc3b50bafb2ac4473dd95f057d1ddc)
(cherry picked from commit d8bc98a8f021d381bf72790ad246f923ac983ad4)
(cherry picked from commit 6404845df9a63802fff4c5bd6cfe1e390076e7f0)
(cherry picked from commit 72bdd4f3b9f6509d1ff3f10ecb12c621a932ed30)
(cherry picked from commit 4b01bb0ce812b6c59414ff53fed728563d8bc9cc)
(cherry picked from commit 66afddd511d2821f648919925ea365cd085e4e77)
(cherry picked from commit 19da0dee9df87cb946d1c8e25b917f7283d95302)
(cherry picked from commit 0b725af693828bd7705b09433fb25d974fbb820e)
(cherry picked from commit 64d4de2b664a9f406b2927c6e6b465ee2b3a8915)
(cherry picked from commit 05bc9d3b7f8d00a37b41615f9caccca84a98c0ee)
(cherry picked from commit 5958553066d275c767018454fbed9470c2cf473d)
(cherry picked from commit c4f77e26c913eb3293bc702e1c65e2d09757cfe1)
(cherry picked from commit 3034832c6637965bf70c766d9169ca3c28c27cd3)
(cherry picked from commit d48931ec5b677989f8b2ef91752b2e3ef25ff2a2)
(cherry picked from commit de3a74e57648c24131d1e3ff83adfb5168e8a686)
(cherry picked from commit 0f6601a37f2cdba41c80b115b9055dbfe62ff862)
(cherry picked from commit ec8bec4fc973f65a3e3250c2cb677ea8257d24d2)
(cherry picked from commit 884560286e902dded3e1cf52322019a0ffd286a1)
(cherry picked from commit 86b26436af85e0eedb732e115e8be024e1d54ca6)
(cherry picked from commit 479cba59aca2b3b73a83e5acc0b754906230f0b2)
(cherry picked from commit 4765f9a889ce7324416b51e7d4524b2368459752)
(cherry picked from commit af771410bfaa511bbc97cbfeefbb279b3836158d)
(cherry picked from commit d1ea9305d8d653d637cbde6d383c095bdc4991f0)
(cherry picked from commit f77e1bb7abd6054851b811fc0d71bf0130085353)
(cherry picked from commit 0b95f8fe899ce14e19e5aeccd3e53e21b8bf8fc1)
(cherry picked from commit 4f8fb2390a415d2f9319c9f23ff653c31efd2409)
(cherry picked from commit 8ea0e22ff6e09f1e46d9a10f1325f7c6997c018b)
(cherry picked from commit 43ac19ac59044210906c96857194231ca7804c92)
(cherry picked from commit 0f51ac12b6e7fcfd24dd9a2a7a14ecfe4869c785)
(cherry picked from commit 35d0875c5e07644c8e49c5aecb308ae67eaa1784)
(cherry picked from commit c30006f45769efecb5d0f605e6c7699f3b1b40b9)
(cherry picked from commit 8696631f5b49b2950fb5d2934a875c569acb9e8e)