Fix regression in apply-config-from-env.py (apache#9097)

### Motivation

Fix the regression that introduced in apache#8709 

In apache#8709, if values contain spaces, the value will be wrapped as "value", this will introduce break changes while users already have some configs with the value that contains spaces, so this PR is reverting this change.

If users want to ensure some values are processed as a group, they should use `export key=\"value\"` instead of implicitly adding `""` when encountering spaces

docker/pulsar/scripts/apply-config-from-env.py

@@ -57,10 +57,6 @@
     for k in sorted(os.environ.keys()):
         v = os.environ[k].strip()
 
-        # Quote the value if it contains a space.
-        if v.find(" ") >= 0:
-            v = '\"%s\"' % v
-
         # Hide the value in logs if is password.
         if "password" in k:
             displayValue = "********"
@@ -81,10 +77,6 @@
         if not k.startswith(PF_ENV_PREFIX):
             continue
 
-        # Quote the value if it contains a space.
-        if v.find(" ") >= 0:
-            v = '\"%s\"' % v
-
         # Hide the value in logs if is password.
         if "password" in k:
             displayValue = "********"