Use proper backend based on preset in amp_big_SUITE

[arcusfelis]

This PR addresses "MIM-2063 amp_big_SUITE would stop working in pgsql_cets backend, if we disable mnesia application".

Proposed changes include:

• Just use mongoose_helper:mnesia_or_rdbms_backend/2 helper.

[mongoose-im]

elasticsearch_and_cassandra_25 / elasticsearch_and_cassandra_mnesia / 3db336d
Reports root/ big
OK: 369 / Failed: 0 / User-skipped: 38 / Auto-skipped: 0

---

small_tests_24 / small_tests / 3db336d
Reports root / small

---

small_tests_25 / small_tests / 3db336d
Reports root / small

---

small_tests_25_arm64 / small_tests / 3db336d
Reports root / small

---

ldap_mnesia_24 / ldap_mnesia / 3db336d
Reports root/ big
OK: 2303 / Failed: 0 / User-skipped: 864 / Auto-skipped: 0

---

ldap_mnesia_25 / ldap_mnesia / 3db336d
Reports root/ big
OK: 2303 / Failed: 0 / User-skipped: 864 / Auto-skipped: 0

---

dynamic_domains_mysql_redis_25 / mysql_redis / 3db336d
Reports root/ big
OK: 4235 / Failed: 0 / User-skipped: 144 / Auto-skipped: 0

---

dynamic_domains_pgsql_mnesia_24 / pgsql_mnesia / 3db336d
Reports root/ big
OK: 4267 / Failed: 0 / User-skipped: 112 / Auto-skipped: 0

---

dynamic_domains_pgsql_mnesia_25 / pgsql_mnesia / 3db336d
Reports root/ big
OK: 4267 / Failed: 0 / User-skipped: 112 / Auto-skipped: 0

---

dynamic_domains_mssql_mnesia_25 / odbc_mssql_mnesia / 3db336d
Reports root/ big
OK: 4264 / Failed: 0 / User-skipped: 115 / Auto-skipped: 0

---

internal_mnesia_25 / internal_mnesia / 3db336d
Reports root/ big
OK: 2453 / Failed: 0 / User-skipped: 714 / Auto-skipped: 0

---

pgsql_cets_25 / pgsql_cets / 3db336d
Reports root/ big
OK: 4654 / Failed: 0 / User-skipped: 121 / Auto-skipped: 0

---

pgsql_mnesia_24 / pgsql_mnesia / 3db336d
Reports root/ big
OK: 4656 / Failed: 0 / User-skipped: 119 / Auto-skipped: 0

---

mysql_redis_25 / mysql_redis / 3db336d
Reports root/ big
OK: 4636 / Failed: 0 / User-skipped: 139 / Auto-skipped: 0

---

pgsql_mnesia_25 / pgsql_mnesia / 3db336d
Reports root/ big
OK: 4656 / Failed: 0 / User-skipped: 119 / Auto-skipped: 0

---

mssql_mnesia_25 / odbc_mssql_mnesia / 3db336d
Reports root/ big
OK: 4653 / Failed: 0 / User-skipped: 122 / Auto-skipped: 0

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (2ea4207) 84.08% compared to head (3db336d) 84.07%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4137      +/-   ##
==========================================
- Coverage   84.08%   84.07%   -0.02%     
==========================================
  Files         558      558              
  Lines       34016    34016              
==========================================
- Hits        28604    28600       -4     
- Misses       5412     5416       +4     

see 7 files with indirect coverage changes

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[chrzaszcz]

Looks good 👍