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stream-clone: allow to change persistent-nodemap format during stream clone

Persistent nodemap affect the store format. However it is fairly isolated and
fast to generate locally. So not making it a fixed part of the stream clone is
useful.

This allow clients without persistent-nodemap support (default for client
without Rust enabled, or simply older client). So it make it possible to enable
persistent nodemap on client, where it can provide a massive boost. without too
much consequence.

To do so, we stop using it in the advertisement requirements for streaming and
let the client add/remove the necessary file depending of its configuration.

We still send the files as it seems like a small save to not regenerate them.
In addition, the way we match them will overlap with the changelog-v2/revlog-v2
so we can't simply skip the associated patterns.

Differential Revision: https://phab.mercurial-scm.org/D12096

== New Features ==


== Default Format Change ==

These changes affects newly created repositories (or new clone) done with
Mercurial 6.1.

The `share-safe` format variant is now enabled by default. It makes
configuration and requirements more consistent across repository and their
shares. This introduces a behavior change as shares from a repository using the
new format will also use their main repository's configuration.

See `hg help config.format.use-share-safe` for details about the feature and
the available options for auto-upgrading existing shares.


== New Experimental Features ==

== Bug Fixes ==

The `--no-check` and `--no-merge` now properly overwrite the behavior from `commands.update.check`.

== Backwards Compatibility Changes ==

The remotefilelog extension now requires an appropiate excludepattern
for subrepositories.

The labels passed to merge tools have changed slightly. Merge tools can get
labels passed to them if you include `$labellocal`, `$labelbase`, and/or
`$labelother` in the `merge-tool.<tool name>.args` configuration. These labels
used to have some space-padding, and truncation to fit within 72 columns. Both
the padding and the truncation has been removed.

Some of the text in labels passed to merge tools has changed. For example,
in conflicts while running `hg histedit`, the labels used to be "local",
"base", and "histedit". They are now "already edited",
"parent of current change", and "current change", respectively.

The use of `share-safe`, means shares (of new repositories) will also use their
main repository's configuration see the `Default Format Change` section
for details.

== Internal API Changes ==

The following functions have been removed:

Miscellaneous: