Small ops cleanups
Consistently use `op_name` and `res_name` and avoid `name`

Use find_common_type instead of np.find_common_type, moving towards de-duping Series/Frame code.
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19972?src=pr&el=h1) Report
> Merging [#19972](https://codecov.io/gh/pandas-dev/pandas/pull/19972?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/a7a7f8c1101aed1a9d37abbbcd80f77da414f0a8?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `97.77%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/19972/graphs/tree.svg?width=650&src=pr&token=eZ4WkYLtcO&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/19972?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #19972   +/-   ##
=======================================
  Coverage   91.65%   91.65%           
=======================================
  Files         150      150           
  Lines       49045    49045           
=======================================
  Hits        44951    44951           
  Misses       4094     4094
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.03% <97.77%> (ø)` | :arrow_up: |
| #single | `41.79% <86.66%> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/19972?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/ops.py](https://codecov.io/gh/pandas-dev/pandas/pull/19972/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvb3BzLnB5) | `96.33% <97.77%> (ø)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19972?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/19972?src=pr&el=footer). Last update [a7a7f8c...ac3f6c5](https://codecov.io/gh/pandas-dev/pandas/pull/19972?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 thanks!