Fix general formatting inconsistencies in files

Basic standardized file formatting style is defined in the project's .editorconfig file. Some files were non-compliant.

Author: per1234

.github/workflows/testdata/reports/all-inputs/arduino-avr-uno.json

@@ -193,4 +193,4 @@
       }
     }
   ]
-}
+}

.github/workflows/testdata/reports/all-inputs/esp8266-esp8266-huzzah.json

@@ -193,4 +193,4 @@
       }
     }
   ]
-}
+}

compilesketches/tests/testdata/test_get_warning_count_from_output/has-warnings.txt

@@ -57,4 +57,4 @@ In order to be certain your installation of a package dependency will be availab
 - uses: arduino/compile-sketches@v1
 ```
 
----
+---

compilesketches/tests/testdata/test_get_warning_count_from_output/no-warnings.txt

@@ -1,36 +1,36 @@
-[tool.black]
-line-length = 120
-
-[tool.poetry]
-name = "compilesketches"
-version = "0.0.0"
-description = ""
-authors = ["Arduino <info@arduino.cc>"]
-
-[tool.poetry.dependencies]
-python = "3.11.2"
-GitPython = "3.1.31"
-PyGithub = "1.58.1"
-PyYAML = "6.0"
-semver = "2.13.0"
-
-[tool.poetry.group.dev.dependencies]
-black = "23.1.0"
-codespell = "2.2.4"
-coverage = "7.2.2"
-pytest = "7.2.2"
-pytest-mock = "3.10.0"
-flake8 = "6.0.0"
-pep8-naming = "0.13.3"
-
-[tool.poetry.group.external]
-# Provided only for use by boards platforms
-# NOTE: This group is a temporary workaround that will be removed at the 2.0.0 release of the action.
-optional = true
-
-[tool.poetry.group.external.dependencies]
-pyserial = "3.5"
-
-[build-system]
-requires = ["poetry-core"]
-build-backend = "poetry.core.masonry.api"
+[tool.black]
+line-length = 120
+
+[tool.poetry]
+name = "compilesketches"
+version = "0.0.0"
+description = ""
+authors = ["Arduino <info@arduino.cc>"]
+
+[tool.poetry.dependencies]
+python = "3.11.2"
+GitPython = "3.1.31"
+PyGithub = "1.58.1"
+PyYAML = "6.0"
+semver = "2.13.0"
+
+[tool.poetry.group.dev.dependencies]
+black = "23.1.0"
+codespell = "2.2.4"
+coverage = "7.2.2"
+pytest = "7.2.2"
+pytest-mock = "3.10.0"
+flake8 = "6.0.0"
+pep8-naming = "0.13.3"
+
+[tool.poetry.group.external]
+# Provided only for use by boards platforms
+# NOTE: This group is a temporary workaround that will be removed at the 2.0.0 release of the action.
+optional = true
+
+[tool.poetry.group.external.dependencies]
+pyserial = "3.5"
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"