libbeat: fix flaky TestConnectionTLS on IPv6 loopback fallback (#51481)

TestConnectionTLS starts an httptest TLS server whose embedded server
certificate was only valid for 127.0.0.1. httptest.newLocalListener first
tries to bind 127.0.0.1:0 and silently falls back to [::1]:0 when that bind
fails. Under stress this fallback occasionally happens, after which the
client connects to https://[::1]:port and TLS verification fails with
"x509: certificate is valid for 127.0.0.1, not ::1", flaking the test.

Regenerate the test CA and the FIPS-invalid server certificate so the leaf
SAN covers both IP:127.0.0.1 and IP:::1 (plus DNS:localhost), making the
test pass regardless of which loopback address httptest binds to. The leaf
key stays RSA 1024-bit, preserving the FIPS-invalid property the test
relies on. Certificates now use a 100-year validity to avoid future expiry.

Author: orestisfl

libbeat/esleg/eslegclient/testdata/ca.crt

@@ -1,23 +1,22 @@
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 -----END CERTIFICATE-----

libbeat/esleg/eslegclient/testdata/fips_invalid.crt

@@ -1,20 +1,21 @@
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 -----END CERTIFICATE-----

libbeat/esleg/eslegclient/testdata/fips_invalid.key

@@ -1,16 +1,16 @@
 -----BEGIN PRIVATE KEY-----
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 -----END PRIVATE KEY-----