Clean up scrape leftovers in the ru_RU bank list

[a-vasyukov]

What is the reason for this PR?

• A new feature
• Fixed an issue

The docblock above $banks in src/Provider/ru_RU/Payment.php records where the list came from:
788 names scraped from banki.ru on 2015-04-04 with a grep | iconv | sed pipeline. The pipeline
left three kinds of debris behind:

Problem	Count	Example
Raw HTML entity	1	'Дж. П. Морган Банк'
Double space where sed -r 's/—//' stripped a dash	10	'Верхневолжский Ярославский филиал'
Latin homoglyph	1	'K2 Банк' — Latin K (U+004B) instead of Cyrillic К (U+041A)

The real bank is АО «К2 Банк» (OGRN 1021500000103), spelled with a Cyrillic К, so 'K2 Банк'
never matches a search for 'К2 Банк' and sorts as a Latin word.

Double spaces are collapsed to a single space rather than restored to a dash: removing an obvious
artefact is a fix, while adding back a character that is not in the data would be a change to the
data set.

Latin letters in 'Эйч-Эс-Би-Си Банк (HSBC)' and 'Ай-Си-Ай-Си-Ай Банк (ICICI)' are left alone —
the source spells out the international brand in parentheses there, and that is intentional.

Author's checklist

• Follow the Contribution Guide
• New features and changes are documented

Summary of changes

• drop the   entity, collapse ten double spaces, replace the Latin K in 'K2 Банк'
• add tests asserting that bank names carry no markup leftovers and use Latin letters only inside
  parentheses

Regarding "avoid changing existing sets of data": no entry is added, removed or reordered, so a
given seed still selects the same positions in the same order. Only characters inside 12 of the 788
values change — the characters that are the defect.

The suite stays green: 1416 tests before, 1418 with the new ones, no failures.

Review checklist

• All checks have passed
• Changes are added to the CHANGELOG.md
• Changes are approved by maintainer

[a-vasyukov]

Two weeks, no CI run — outside contributors need manual approval, so the added tests are verified
locally only.

One call here is yours rather than mine: the ten double spaces are collapsed to a single space, not
restored to the — that sed stripped in 2015. If you read the dash as part of the original names,
I'll push that version instead.

The same defects exist in 1.24 — backport now, or after this lands?

[pwsdotru]

As native Russian speaker I confirm this changes.