feat(secret,variable): read values like gh and report stored names

secret set and variable set read the value from -b/--body, -F/--body-file
or standard input when it is not a terminal (one trailing line break
removed), and otherwise prompt for it; --env-file sets every NAME=value
of a dotenv file. --value and --value-file keep working. The scope flags
are -o/--org and --account on each command, and secret list no longer
offers --account, which Gitea cannot list.

Commands report what they did, naming the scope and the name Gitea
stores: "Set Actions secret LOWER_NAME for alice/x (names are
upper-cased)"; --json returns the stored name and omits an unknown
creation time. Deleting asks "Delete secret X from alice/x?". Lists show
NAME, CREATED and DESCRIPTION for secrets and NAME, VALUE and DESCRIPTION
for variables; variable view shows a record and the new variable get
prints the raw value. A missing secret or variable is reported by name
and scope.

The global --user selects the account tea acts as, unlike gh's --user,
so secret and variable add a note on a terminal pointing to --account
when it is given, as run list does for --actor. Help explains the scopes.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/app_test.go

@@ -544,18 +544,11 @@ const (
 	search issue
 	search pr
 	search repo
-	secret delete
-	secret list
-	secret set
 	status
 	time create
 	time delete
 	time list
 	time reset
-	variable delete
-	variable list
-	variable set
-	variable view
 	wiki create
 	wiki delete
 	wiki edit
@@ -581,9 +574,7 @@ const (
 	release asset
 	repo
 	search
-	secret
 	time
-	variable
 	wiki
 `
 )