Add tests.toml file for all exercises with canonical data

exercises/hello-world/.meta/tests.toml

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+[canonical-tests]
+
+# Say Hi!
+"af9ffe10-dc13-42d8-a742-e7bdafac449d" = true

exercises/leap/.meta/tests.toml

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+[canonical-tests]
+
+# year not divisible by 4 in common year
+"6466b30d-519c-438e-935d-388224ab5223" = true
+
+# year divisible by 2, not divisible by 4 in common year
+"ac227e82-ee82-4a09-9eb6-4f84331ffdb0" = true
+
+# year divisible by 4, not divisible by 100 in leap year
+"4fe9b84c-8e65-489e-970b-856d60b8b78e" = true
+
+# year divisible by 4 and 5 is still a leap year
+"7fc6aed7-e63c-48f5-ae05-5fe182f60a5d" = true
+
+# year divisible by 100, not divisible by 400 in common year
+"78a7848f-9667-4192-ae53-87b30c9a02dd" = true
+
+# year divisible by 100 but not by 3 is still not a leap year
+"9d70f938-537c-40a6-ba19-f50739ce8bac" = true
+
+# year divisible by 400 in leap year
+"42ee56ad-d3e6-48f1-8e3f-c84078d916fc" = true
+
+# year divisible by 400 but not by 125 is still a leap year
+"57902c77-6fe9-40de-8302-587b5c27121e" = true
+
+# year divisible by 200, not divisible by 400 in common year
+"c30331f6-f9f6-4881-ad38-8ca8c12520c1" = true

exercises/resistor-color/.meta/tests.toml

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+[canonical-tests]
+
+# Black
+"49eb31c5-10a8-4180-9f7f-fea632ab87ef" = true
+
+# White
+"0a4df94b-92da-4579-a907-65040ce0b3fc" = true
+
+# Orange
+"5f81608d-f36f-4190-8084-f45116b6f380" = true
+
+# Colors
+"581d68fa-f968-4be2-9f9d-880f2fb73cf7" = true

exercises/two-fer/.meta/tests.toml

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+[canonical-tests]
+
+# no name given
+"1cf3e15a-a3d7-4a87-aeb3-ba1b43bc8dce" = true
+
+# a name given
+"b4c6dbb8-b4fb-42c2-bafd-10785abe7709" = true
+
+# another name given
+"3549048d-1a6e-4653-9a79-b0bda163e8d5" = true