Renamed phpstan.neon to phpstan.dist.neon (#100)

* Renamed phpstan.neon to phpstan.dist.neon

To better fit the best practices (https://phpstan.org/config-reference#config-file):
> The usual practice is to have phpstan.neon.dist or phpstan.dist.neon under version control, and allow the user to override certain settings in their environment (on their own computer or on a continuous integration server) by creating phpstan.neon that’s present in .gitignore

* Fixed entry in .gitignore

.gitignore

@@ -47,6 +47,9 @@ build/*
 # For local development
 z_local*
 
+# Per user PHPStan configuration
+phpstan.neon
+
 # Prerequisites
 *.d
 

composer.json

@@ -65,12 +65,12 @@
             "phpcbf ./tests/"
         ],
         "phpstan-junit-report-for-ci": [
-            "phpstan analyse --error-format=junit -c ./phpstan.neon ./prod/php/ --level max --memory-limit=1G | tee build/elastic-otel-phpstan-junit.xml",
-            "phpstan analyse --error-format=junit -c ./phpstan.neon ./tests/ --level max --memory-limit=1G --error-format=junit | tee build/tests-phpstan-junit.xml"
+            "phpstan analyse --error-format=junit ./prod/php/ --level max --memory-limit=1G | tee build/elastic-otel-phpstan-junit.xml",
+            "phpstan analyse --error-format=junit ./tests/ --level max --memory-limit=1G --error-format=junit | tee build/tests-phpstan-junit.xml"
         ],
         "phpstan": [
-            "phpstan analyse -c ./phpstan.neon ./prod/php/ --level max --memory-limit=1G",
-            "phpstan analyse -c ./phpstan.neon ./tests/ --level max --memory-limit=1G"
+            "phpstan analyse ./prod/php/ --level max --memory-limit=1G",
+            "phpstan analyse ./tests/ --level max --memory-limit=1G"
         ],
         "static_check": [
             "composer run-script -- parallel-lint",