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Switch from `flatKeywordList()` to flat arrays (#676)

Part of preparations for PR #673

Copied from [my original
comment](https://github.com/sql-formatter-org/sql-formatter/pull/673#issuecomment-1830518684):

I see there is no distinction in the keyword tokens between `all` and
`dataType` / `datatype` / `dataTypes`:


https://github.com/sql-formatter-org/sql-formatter/blob/<a class=hub.com/sql-formatter-org/sql-formatter/commit/<a class="double-link" href="https://git"><a class=hub.com/sql-formatter-org/sql-formatter/commit/<a class="double-link" href="https://git"><a class=hub.com/sql-formatter-org/sql-formatter/commit/<a class="double-link" href="https://git"><a class=hub.com/sql-formatter-org/sql-formatter/commit/290f3b767492d5e3204866447f9f4e4c098f825f">290f3b767/src/languages/postgresql/postgresql.keywords.ts#L4-L8


https://github.com/sql-formatter-org/sql-formatter/blob/290f3b767492d5e3204866447f9f4e4c098f825f/src/languages/transactsql/transactsql.functions.ts#L78-L83


https://github.com/sql-formatter-org/sql-formatter/blob/290f3b767492d5e3204866447f9f4e4c098f825f/src/languages/snowflake/snowflake.keywords.ts#L102-L106


https://github.com/sql-formatter-org/sql-formatter/blob/290f3b767492d5e3204866447f9f4e4c098f825f/src/languages/transactsql/transactsql.functions.ts#L303-L309

This is because of the `flatKeywordList()` function, which effectively
discards the key information:


https://github.com/sql-formatter-org/sql-formatter/blob/290f3b767492d5e3204866447f9f4e4c098f825f/src/utils.ts#L18-L20

Because of this, I would like to simplify the
`src/languages/*/*.keywords.ts` files to export 1 flat array (with empty
lines + comments as separators instead of object keys) and delete the
`flatKeywordList()` function - this will prevent unusual, inconsistent
naming conventions and also clarify that the object keys do nothing.

## Reviewer notes

1. Best to review this with whitespace changes turned off:
https://github.com/sql-formatter-org/sql-formatter/pull/676/files?w=1
2. This PR also enables GitHub Actions workflows CI for pull requests on
branches other than `master` and `develop`, so that PRs from community
members can be tested on GitHub Actions
3. while removing the object keys, I added comments as such:
a. if there was a commented URL above the key, I remov... (continued)

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