test: use both bundle formats in test-bookmarks-pushpull It is valuable to have both formats tested.

test: explicitly test wire protocol discovery with bundle1 and bundle2 We want to make sure the behavior is similar in both cases.

test: use bundle2 for exchange in test-push-warn Using bundle2 for exchange unlocks the usage of changegroup version 2. This version of the changegroup held more information (delta base) that result in a small increase in content size (20 bytes).

test: use bundle2 for exchange in test-largefile Using bundle2 for exchange unlock the usage of changegroup version 2. This version of the changegroup held more information (delta base) that result in a small increase in content size. It also lead to reordering of output because the exchange scheduling is a bit different.

test: use bundle2 for exchange in test-push-warn Using bundle2 for exchange unlocks the usage of changegroup version 2. This version of the changegroup held more information (delta base) that result in a small increase in content size (20 bytes x 2 changes).

test: use bundle2 for exchange in test-bookmark-pushpull This lets us adapt to changes in obsmarkers exchange output earlier.

test: use bundle2 for exchange in test-obsolete The bundle2 version of obsmarkers exchange is more informative. Switching to bundle2 by default will change the output of this tests. To reduce the noise when switching bundle2 to the default protocol, we migrate this tests early.

revert: remove unused debug code in the test file I left a test environment variable in a previous commit and it is doing nothing useful. This patch removes it.