Strip ANSI escape color sequences from /latest log responses (#6319)

* Strip ANSI escape color sequences from /latest log responses

Strip ANSI sequences of CSI commands [1] used for log coloring from
/latest log endpoints. These endpoint were primarily designed for log
downloads and colors are mostly not wanted in those. Add optional
argument for stripping the colors from the logs and enable it for the
/latest endpoints.

[1] https://en.wikipedia.org/wiki/ANSI_escape_code#CSIsection

* Refactor advanced logs' tests to use fixture factory

Introduce `advanced_logs_tester` fixture to simplify testing of advanced logs
in the API tests, declaring all the needed fixture in a single place. # Please
enter the commit message for your changes. Lines starting

tests/host/test_logs.py

@@ -90,6 +90,49 @@ async def test_logs_coloured(journald_gateway: MagicMock, coresys: CoreSys):
         )
 
 
+async def test_logs_no_colors(journald_gateway: MagicMock, coresys: CoreSys):
+    """Test ANSI color codes being stripped when no_colors=True."""
+    journald_gateway.content.feed_data(
+        load_fixture("logs_export_supervisor.txt").encode("utf-8")
+    )
+    journald_gateway.content.feed_eof()
+
+    async with coresys.host.logs.journald_logs() as resp:
+        cursor, line = await anext(journal_logs_reader(resp, no_colors=True))
+        assert (
+            cursor
+            == "s=83fee99ca0c3466db5fc120d52ca7dd8;i=2049389;b=f5a5c442fa6548cf97474d2d57c920b3;m=4263828e8c;t=612dda478b01b;x=9ae12394c9326930"
+        )
+        # Colors should be stripped
+        assert (
+            line == "24-03-04 23:56:56 INFO (MainThread) [__main__] Closing Supervisor"
+        )
+
+
+async def test_logs_verbose_no_colors(journald_gateway: MagicMock, coresys: CoreSys):
+    """Test ANSI color codes being stripped from verbose formatted logs when no_colors=True."""
+    journald_gateway.content.feed_data(
+        load_fixture("logs_export_supervisor.txt").encode("utf-8")
+    )
+    journald_gateway.content.feed_eof()
+
+    async with coresys.host.logs.journald_logs() as resp:
+        cursor, line = await anext(
+            journal_logs_reader(
+                resp, log_formatter=LogFormatter.VERBOSE, no_colors=True
+            )
+        )
+        assert (
+            cursor
+            == "s=83fee99ca0c3466db5fc120d52ca7dd8;i=2049389;b=f5a5c442fa6548cf97474d2d57c920b3;m=4263828e8c;t=612dda478b01b;x=9ae12394c9326930"
+        )
+        # Colors should be stripped in verbose format too
+        assert (
+            line
+            == "2024-03-04 22:56:56.709 ha-hloub hassio_supervisor[466]: 24-03-04 23:56:56 INFO (MainThread) [__main__] Closing Supervisor"
+        )
+
+
 async def test_boot_ids(
     journald_gateway: MagicMock,
     coresys: CoreSys,