yamllint: fix all yamllint truthy errors

Fix all thruthy errors detected by yamllint:

yamllint -f parsable -c .yamllint $( find -regex '.*\.y[a]*ml' ) | \
  grep '(truthy)'

This only accepts true/false for boolean properties. Seems like python
takes all sort of formats:

https://github.com/yaml/pyyaml/blob/master/lib/yaml/constructor.py#L224-L235

But the current specs only mention "true" or "false"

https://yaml.org/spec/1.2.2/#10212-boolean

Which is the standard yamllint config.

Excluding codeconv and workflow files, as some are using yes/no instead
in the respective documentation.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>

scripts/schemas/twister/hwmap-schema.yaml

@@ -1,7 +1,7 @@
 type: seq
 sequence:
   - type: map
-    required: no
+    required: false
     mapping:
       "available":
         type: bool
@@ -52,6 +52,6 @@ sequence:
         required: false
       "fixtures":
         type: seq
-        required: no
+        required: false
         sequence:
           - type: str

scripts/schemas/twister/quarantine-schema.yaml

@@ -11,7 +11,7 @@ type: seq
 matching: all
 sequence:
   - type: map
-    required: yes
+    required: true
     matching: all
     mapping:
       "scenarios":
@@ -19,13 +19,13 @@ sequence:
         required: true
         sequence:
           - type: str
-          - unique: True
+          - unique: true
       "platforms":
         required: true
         type: seq
         sequence:
           - type: str
-          - unique: True
+          - unique: true
       "comment":
         type: str
         required: false