Align custom scripts with generic scripts (#445)

Align custom scripts with generic scripts, making them configurable. This has a few advantages:

- script code is more unified,
- no more hard-coded method names in scripts, which is less error prone and make it easier to rename scripts,
- no more hard coded product names in scripts, which is less error prone and make it easier to rename products,
- less hard-coded URLs and regexes in scripts, which makes auto-configuration more expressive / updatable,

Also added method `endoflife.list_configs_from_argv()` so that it is easier to manipulate scripts arguments.

src/graalvm.py

@@ -1,12 +1,9 @@
 import logging
-import sys
 
 from bs4 import BeautifulSoup
 from common import dates, endoflife, http, releasedata
 
-p_filter = sys.argv[1] if len(sys.argv) > 1 else None
-m_filter = sys.argv[2] if len(sys.argv) > 2 else None
-for config in endoflife.list_configs(p_filter, "graalvm", m_filter):
+for config in endoflife.list_configs_from_argv():
     with releasedata.ProductData(config.product) as product_data:
         response = http.fetch_url(config.url)
         html = BeautifulSoup(response.text, features="html5lib")