DEPR: Added is_copy to NDFrame._deprecations
Should have been part of PR #18801 

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18922?src=pr&el=h1) Report
> Merging [#18922](https://codecov.io/gh/pandas-dev/pandas/pull/18922?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/6164da24a7d3f9469fcad8b987c9c7fac1c8dd25?src=pr&el=desc) will **increase** coverage by `0.01%`.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/18922/graphs/tree.svg?src=pr&token=eZ4WkYLtcO&width=650&height=150)](https://codecov.io/gh/pandas-dev/pandas/pull/18922?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #18922      +/-   ##
==========================================
+ Coverage   91.65%   91.67%   +0.01%     
==========================================
  Files         154      154              
  Lines       51368    51368              
==========================================
+ Hits        47080    47090      +10     
+ Misses       4288     4278      -10
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `89.54% <ø> (+0.01%)` | :arrow_up: |
| #single | `40.84% <ø> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/18922?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/generic.py](https://codecov.io/gh/pandas-dev/pandas/pull/18922/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZ2VuZXJpYy5weQ==) | `95.92% <ø> (ø)` | :arrow_up: |
| [pandas/util/testing.py](https://codecov.io/gh/pandas-dev/pandas/pull/18922/diff?src=pr&el=tree#diff-cGFuZGFzL3V0aWwvdGVzdGluZy5weQ==) | `84.68% <0%> (-0.22%)` | :arrow_down: |
| [pandas/plotting/\_converter.py](https://codecov.io/gh/pandas-dev/pandas/pull/18922/diff?src=pr&el=tree#diff-cGFuZGFzL3Bsb3R0aW5nL19jb252ZXJ0ZXIucHk=) | `66.95% <0%> (+1.73%)` | :arrow_up: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/18922?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/18922?src=pr&el=footer). Last update [6164da2...2c24813](https://codecov.io/gh/pandas-dev/pandas/pull/18922?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 thanks @cbertinato 