CLN: Removed overridden Timedelta properties (#18242)
- [X] closes #18242 
- [X] tests added / passed
- [X] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [X] whatsnew entry

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18374?src=pr&el=h1) Report
> Merging [#18374](https://codecov.io/gh/pandas-dev/pandas/pull/18374?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/a172ff9dd32d7f6ba077c82b6cf6a31dcc7f2b45?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/18374/graphs/tree.svg?height=150&src=pr&width=650&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/18374?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #18374   +/-   ##
=======================================
  Coverage   91.38%   91.38%           
=======================================
  Files         164      164           
  Lines       49797    49797           
=======================================
  Hits        45508    45508           
  Misses       4289     4289
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.17% <0%> (ø)` | :arrow_up: |
| #single | `39.61% <0%> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18374?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/18374?src=pr&el=footer). Last update [a172ff9...0ffe884](https://codecov.io/gh/pandas-dev/pandas/pull/18374?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 thanks!