Do not execute conda-specific code if conda is not installed

1) Got rid of useless call to `cat`, much better to simply use sed with
   file as argument.

2) Got rid of `sort -u`. There is no need to sort the list.
   Additionally, the list `pyenv.d/rehash/conda.d/default.list` only has
   unique entries, and even if you have duplicate entries, the function
   will still work. --> No need for sort nor unique.

3) Further improvement is simple, save a cached
cleaned-list-v1.0 in `conda.d` and simple read from that file instead of
doing `sed`, which must be a more expensive operation than simply
reading from file.

Applies to the conda blacklist in `pyenv.d/rehash/conda.d/default.list`
No practical difference, but it looks misplaced when it sits at the end
of the file.

I was doing some debugging with PYENV_DEBUG=1 and noticed that a lot of
work was being done in conda.bash, even though I had not installed any
conda versions like `mambaforge`.

The solution is pretty simple, put all the code inside an if-block.
This aligns with what @varikin found in his pull request #3037

Additionally, I have refactored the code slightly for readability
(created function `build_conda_exclusion_list`), and added comments
which should make it easier to understand what's going on.

This commit simplifies debugging and should reduce the execution time of

```bash
eval "$(pyenv init -)"
```

slightly.

Source tarballs were changed to fix a human error: https://discuss.python.org/t/python-3-14-0-alpha-5/80364/3

Co-authored-by: binbjz <zhaobin@avenir.hk>
Co-authored-by: binbjz <binbjz@gmail.com>

ubuntu-20.04 is being retired by Github
tar_gz is mainly to verify URLs, OS version doesn't matter

* Add miniconda3-25.1.1-0

Co-authored-by: binbjz <zhaobin@avenir.hk>
Co-authored-by: binbjz <binbjz@gmail.com>

Co-authored-by: Dan Dees <dand@appsmiths.com>

Now that ubuntu-24 is out of beta at Github

Since for ubuntu_build, we only use one OS version
and the changes between versions are not as drastic as with MacOS,
it seems safe to have it upgrade automatically.

Only CPython scripts use bundled dependencies for MacOS and two alternative tarballs

* report more progress
* don't download SHA files for unsupported architectures

* future-proof PyVersion
* fix handling "-latest"
* Update default versions
* change -v argument to bool

* perf: replace a series of if statements with a case block. Add error
handling for case where unknown option is provided.
Same setup as rbenv-init for reading arguments.

* perf, docs: Recommend users to specify the shell for `pyenv init -`
Speeds up the startup by about 40% (in local testing, from ~50ms to ~30ms).
Reflect this in `pyenv init` hint text.

* style: remove unnecessary `root` variable in pyenv-init
* style: remove unnecessary variable declarations at the top of file in pyenv-init.

* perf: replace `cat <<` calls with `echo`
The builtin `echo` is about 100x faster. In tests, saves about 2-3ms.

* docs: document the `pyenv init - <shell>` performance boost in the Advanced Configuration section.

* style: test_helper.bash: avoid unnecessary ".." in produced PATH

* docs: fix a false statement about completions location in the Advanced Configuration section.

Co-authored-by: binbjz <zhaobin@avenir.hk>

Addendum to #3134 as per https://github.com/pyenv/pyenv/pull/3134#issuecomment-2545710044

Requested in https://github.com/pyenv/pyenv/issues/2680
for deployments with a stock `.pyenv-version` that can use any
of a number of Python versions
and for compatibility with `uv`.

* Support `pyenv local --force`
* Support `pyenv-version-file-write --force`
* Support `pyenv version-name --force`
* Ignore missing versions when searching for executables
* Display "commmand not found" even when there are nonexistent versions

* exec.bats: replace `python` and `rspec` with something that doesn't exist globally, either
in Ubuntu Github CI, `python` exists globally

`shell` does not fall through to `local`, and `local to `global`.

There's a complaint that this results in duplicate PATH entries in nested shells, will deal with that separately

add test to test all the flag types

Co-authored-by: native-api <vano@mail.mipt.ru>

missed some of the changes

* Skip building bundled OpneSSL unnecessary parts
* Remove bundled OpneSSL build hack: no longer needed