Remove spacesOss plugin (elastic#109258)

Author: jportner

.eslintrc.js

@@ -1567,7 +1567,6 @@ module.exports = {
     {
       files: [
         'src/plugins/security_oss/**/*.{js,mjs,ts,tsx}',
-        'src/plugins/spaces_oss/**/*.{js,mjs,ts,tsx}',
         'src/plugins/interactive_setup/**/*.{js,mjs,ts,tsx}',
         'x-pack/plugins/encrypted_saved_objects/**/*.{js,mjs,ts,tsx}',
         'x-pack/plugins/security/**/*.{js,mjs,ts,tsx}',

.github/CODEOWNERS

@@ -280,7 +280,6 @@
 # Security
 /src/core/server/csp/ @elastic/kibana-security @elastic/kibana-core
 /src/plugins/security_oss/ @elastic/kibana-security
-/src/plugins/spaces_oss/ @elastic/kibana-security
 /src/plugins/interactive_setup/ @elastic/kibana-security
 /test/security_functional/ @elastic/kibana-security
 /x-pack/plugins/spaces/ @elastic/kibana-security