[action] [PR:20726] [database]: Fix "program:redisprogram:redis_bmp" ERR from supervisor (#20726)

[mssonicbld]

== Why I did it ==

Commit 06c469e added an extra redis instance. This resulted in a
two item string without linefeeds in /etc/supervisor/critical_processes:

program:redisprogram:redis_bmp

That resulted in an error in syslog and docker-database failing.

== Work item tracking ==

ERR database#supervisor-proc-exit-listener: Syntax of the line
program:redisprogram:redis_bmp#012 in processes file is incorrect.
Exiting... (#20636)

ossobv#17

== How I did it ==

Replace the jinja2 whitespace eating hyphens from BOL to EOL.

Note that j2 and the jinja2 parser in sonig-cfggen do not behave the
same. The sonig-cfggen is the relevant one.

Before:

$ j2 ./dockers/docker-database/critical_processes.j2.old -f json
<<< '{"INSTANCES":{"foo":"bar","baz":"..."}}'
|
|
program:foo
program:baz

docker exec database sonic-cfggen \

  -j /var/run/redis/sonic-db/database_config.json \
  -t /usr/share/sonic/templates/critical_processes.j2.old

program:redisprogram:redis_bmp

After:

$ j2 ./dockers/docker-database/critical_processes.j2 -f json
<<< '{"INSTANCES":{"foo":"bar","baz":"..."}}'
program:foo
program:baz

docker exec database sonic-cfggen \

  -j /var/run/redis/sonic-db/database_config.json \
  -t /usr/share/sonic/templates/critical_processes.j2

program:redis
program:redis_bmp
|

After this fix, the output in /etc/supervisor/critical_processes is
correct and the error from docker-database is gone.

[mssonicbld]

Original PR: #20726