Screen clear is added to batch-mode SSH commands if FIPS-mode is active

[kvecheraw]

Expected behavior:

When a remote command is executed without a terminal in FIPS-mode, nothing is added to output

Current behavior:

A clear screen sequence "ESC[3JESCc" is added for a non-terminal command in FIPS-mode

Bug details:

• Teleport version
  Server: Teleport Enterprise v15.3.0 git:v15.3.0-0-g0a192a4 go1.21.9 X:boringcrypto
  Client: Teleport v15.3.0 git:v15.3.0-0-g0a192a4 go1.21.9 X:boringcrypto

• Recreation steps

$ tsh ssh --no-tty root@proxy echo 'a' </dev/null 2>/dev/null | od -a test
0000000   a  nl esc   [   3   J esc   c  nl
0000011