Move scripts used in CI to the new location (#5198)

* Move CI scripts and update references

* Update paths in .gitlab-ci.yml

* Removed outdated entries from CODEOWNERS

polkadot/scripts/ci/gitlab/spellcheck.toml

@@ -0,0 +1,27 @@
+[hunspell]
+lang = "en_US"
+search_dirs = ["."]
+extra_dictionaries = ["lingua.dic"]
+skip_os_lookups = true
+use_builtin = true
+
+[hunspell.quirks]
+# He tagged it as 'TheGreatestOfAllTimes'
+transform_regex = [
+# `Type`'s
+	"^'([^\\s])'$",
+# 5x
+# 10.7%
+	"^[0-9_]+(?:\\.[0-9]*)?(x|%)$",
+# Transforms'
+	"^(.*)'$",
+# backslashes
+	"^\\+$",
+	"^[0-9]*+k|MB|Mb|ms|Mbit|nd|th|rd$",
+# single char `=` `>` `%` ..
+	"^=|>|<|%$",
+# 22_100
+	"^(?:[0-9]+_)+[0-9]+$"
+]
+allow_concatenation = true
+allow_dashes = true