pgsql: Add more sanity checks with callers of changeDependencyFor()

Add more sanity checks with callers of changeDependencyFor()

changeDependencyFor() returns the number of pg_depend entries changed,
or 0 if there is a problem.  The callers of this routine expect only one
dependency to change, but they did not check for the result returned.
The following code paths gain checks:
- Namespace for extensions.
- Namespace for various object types (see AlterObjectNamespace).
- Planner support function for a function.

Some existing error messages related to all that are reworded to be more
consistent with the project style, and the new error messages added
follow the same style.  This change has exposed one bug fixed a bit
earlier with bd5ddbe.

Reviewed-by: Heikki Linnakangas, Akshat Jaimini
Discussion: https://postgr.es/m/ZJzD/rn+UbloKjB7@paquier.xyz

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/9b286858e3ab1647304c5fbb2b1529de6bead8f7

Modified Files
--------------
src/backend/commands/alter.c        |  8 +++++---
src/backend/commands/cluster.c      |  4 ++--
src/backend/commands/extension.c    |  8 +++++---
src/backend/commands/functioncmds.c | 10 +++++++---
src/backend/commands/tablecmds.c    |  2 +-
src/backend/commands/typecmds.c     |  2 +-
6 files changed, 21 insertions(+), 13 deletions(-)