Replica promote (#12090)

## Problem

This PR is part of larger computes support activity:

https://www.notion.so/neondatabase/Larger-computes-114f189e00478080ba01e8651ab7da90

Epic: https://github.com/neondatabase/cloud/issues/19010

In case of planned node restart, we are going to 
1. create new read-only replica
2. capture LFC state at primary
3. use this state to prewarm replica
4. stop old primary
5. promote replica to primary

Steps 1-3 are currently implemented and support from compute side.
This PR provides compute level implementation of replica promotion.

Support replica promotion

## Summary of changes

Right now replica promotion is done in three steps:
1. Set safekeepers list (now it is empty for replica)
2. Call `pg_promote()` top promote replica
3. Update endpoint setting to that it ids not more treated as replica.

May be all this three steps should be done by some function in
compute_ctl. But right now this logic is only implement5ed in test.

Postgres submodules PRs:
https://github.com/neondatabase/postgres/pull/648
https://github.com/neondatabase/postgres/pull/649
https://github.com/neondatabase/postgres/pull/650
https://github.com/neondatabase/postgres/pull/651

---------

Co-authored-by: Matthias van de Meent <matthias@neon.tech>
Co-authored-by: Konstantin Knizhnik <knizhnik@neon.tech>

vendor/revisions.json

@@ -1,18 +1,18 @@
 {
   "v17": [
     "17.5",
-    "8be779fd3ab9e87206da96a7e4842ef1abf04f44"
+    "db424d42d748f8ad91ac00e28db2c7f2efa42f7f"
   ],
   "v16": [
     "16.9",
-    "0bf96bd6d70301a0b43b0b3457bb3cf8fb43c198"
+    "7a4c0eacaeb9b97416542fa19103061c166460b1"
   ],
   "v15": [
     "15.13",
-    "de7640f55da07512834d5cc40c4b3fb376b5f04f"
+    "8c3249f36c7df6ac0efb8ee9f1baf4aa1b83e5c9"
   ],
   "v14": [
     "14.18",
-    "55c0d45abe6467c02084c2192bca117eda6ce1e7"
+    "6770bc251301ef40c66f7ecb731741dc435b5051"
   ]
 }