Add a configuration flag for enabling multiseal (Seal HA), CE side (#25908)

* Add a configuration flag for enabling multiseal (Seal HA), CE side

* imports

* no quotes

* get rid of dep on ent config

* Abstract enableMultiSeal for a build time switch

* license headers

* wip

* gate physical seal gen fetch by a param

* docs tweak, remove core flag

* updates from the ent pr

* update stub

* update test fixtures for enable_multiseal

* use accessor

* add a test fixture for non-multiseal diagnose

* remove debugging crtuch

* Do handle phys seal gen info even if multiseal is off, in order to facilitate enable/disable safeties

* more enabled flag handling

* Accept seal gen info if we were previously disabled, and persist it

* update unit test

* Validation happens postUnseal, so this test is invalid

* Dont continue setting conf if seal loading fails during SIGHUP

* Update website/content/docs/configuration/seal/seal-ha.mdx

Thanks, that does sound much clearer

Co-authored-by: Jason O'Donnell <2160810+jasonodonnell@users.noreply.github.com>

* use validation if previous gen was enabled

* unit test update

* stub SetMultisealEnabled

* bring over more changes from ent

* this was an unfix

---------

Co-authored-by: Jason O'Donnell <2160810+jasonodonnell@users.noreply.github.com>

command/server/config.go

@@ -748,7 +748,7 @@ func ParseConfig(d, source string) (*Config, error) {
 		return nil, fmt.Errorf("error validating experiment(s) from config: %w", err)
 	}
 
-	if err := result.parseConfig(list); err != nil {
+	if err := result.parseConfig(list, source); err != nil {
 		return nil, fmt.Errorf("error parsing enterprise config: %w", err)
 	}