Mark /configure file as generated in .gitattributes

[arhadthedev]

BPO	46038
Nosy	@arhadthedev
PRs	bpo-46038: Mark /configure file as generated in .gitattributes #30031 Update generated files list and add diff=generated attribute #30745

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2022-01-21.13:47:24.929>
created_at = <Date 2021-12-10.16:19:15.195>
labels = ['type-feature', 'build', '3.11']
title = 'Mark /configure file as generated in .gitattributes'
updated_at = <Date 2022-01-21.13:47:24.929>
user = 'https://github.com/arhadthedev'

bugs.python.org fields:

activity = <Date 2022-01-21.13:47:24.929>
actor = 'arhadthedev'
assignee = 'none'
closed = True
closed_date = <Date 2022-01-21.13:47:24.929>
closer = 'arhadthedev'
components = ['Build']
creation = <Date 2021-12-10.16:19:15.195>
creator = 'arhadthedev'
dependencies = []
files = []
hgrepos = []
issue_num = 46038
keywords = ['patch']
message_count = 2.0
messages = ['408218', '411128']
nosy_count = 1.0
nosy_names = ['arhadthedev']
pr_nums = ['30031', '30745']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue46038'
versions = ['Python 3.11']

[arhadthedev]

configure is regenerated from configure.ac using a custom container with appropriate version of tools (quay.io/tiran/cpython_autoconf by Christian Heimes). As a result, configure falls into the same category as files generated by Argument Clinic, Freeze and Parser/asdl_c.py. Due to size and churn of these artifacts, they are marked in .gitattributes as generated so GitHub Pull Request Diff Viewer collapses them into a short notification. The pull request associated with this issue does the same for configure.

Actually, configure diff is so large that sometimes it crosses a threshold and GitHub collapses it by force with "Large diffs are not rendered by default" or even "xxx additions, yyy deletions not shown because the diff is too large. Please use a local Git client to view these changes". See #73942 as an extreme example (15,430 insertions and deletions) and <https://github.com/python/cpython/commits/main/configure\> for an average.

[arhadthedev]

Superseded by <https://github.com/python/core-workflow/issues/425\>. The PR itself is included as a part of PR30745.