tests: add e2e tclfmt tests

build(deps): bump submodules/OpenROAD from `21ced69` to `f2a2115`

Bumps [submodules/OpenROAD](https://github.com/The-OpenROAD-Project/OpenROAD) from `21ced69` to `f2a2115`.
- [Release notes](https://github.com/The-OpenROAD-Project/OpenROAD/releases)
- [Commits](The-OpenROAD-Project/OpenROAD@21ced69...f2a2115)

---
updated-dependencies:
- dependency-name: submodules/OpenROAD
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

openroad: patch `remove_buffers`

openroad: fix help preprocessing

Takes care of comments and blank lines.

tests: unskip test_eval_braced_multi_arg

Just specify its actual behavior, with the other possible behavior
commented out. Also deletes TODO in utils.eval(), since the current
behavior is actually what we want.

config: make extensions configurable

Also adds .upf as a default.

config: escape exclude patterns starting with #

Since these entries are embedded in a TOML file that already supports
comments, we don't need to support comments in patterns. Adding this
escape allows users to easily match against paths starting with a
literal #, in the off chance they need to.

cli: support reading from stdin

checks: actually use `backslash-spacing`

parser: handle script argument subparsing in Parser

This is more consistent with how exprs and lists are handled.